Mwahaha! INTRODUCING THE NEW Super Ultra Mega Amazing Blog Post Spectacular as posted by Me!

Haha i just got back from work not too long ago, so naturally I was tired.....

BUT NOW HERE I AM FULLY ENERGIZED AFTER SOME DELICIOUS LIQUID CAFFEINE AND A WHOLE BUNCH OF ENERGY BARS READY TO BLOG!!!! LET'S GET 'ER DONE!!

So basically on Friday we went over something from a while back... That few pages of fill in the blank-y type stuff XD The Chapter 14 Study guide if that helps you at all? Anyways heres how the blanks got filled:

REFLECTION OF WAVES:
The direction of waves moving in two or three dimensions is shown by RAY diagrams. The ray that reaches a barrier is called the INCIDENT ray. The ray that moves back from the barrier is called the REFLECTED ray. The direction of the barrier is shown by a line drawn at a(n) RIGHT ANGLE to the barrier. This line is called the NORMAL. The angle between the INCIDENT ray and the NORMAL is called the angle of incidence. The angle between the REFLECTED ray and the NORMAL is called the angle of reflection. The law of REFLECTION states that the angle of incidence equals the angle of reflection.

REFRACTION OF WAVES:
In water waves, the velocity is SLOWER in shallower water. If the incident ray is parallel to the normal, there is a change in the velocity and WAVELENGTH of the wave. If the incident ray is not parallel to the normal, there is a change in velocity, wavelength, and DIRECTION of the wave. The change in DIRECTION of a wave at the boundary between two media is called refraction.

As for the last par t about
DIFFRACTION AND INTERFERENCE OF WAVES... i only have the answers to the blanks which are: circular, diffraction, wavelength, less, resulting, constructive, destructive

And then TODAY in class we watched a quick video talking about what we were about to do which waaaaaaas.... read through pages 13 -18 as a class in our super special awesome "Grade 11 Physics: Waves in Two Dimensions" booklet/study guide thang XD ( even though i didn't aget a chance to read D= ) Covering such lovely topics as :

DIFFRACTION AROUND A SHARP BARRIER: VARYING WAVELENGTH

DIFFRACTION THROUGH AN OPENING: VARYING SIZE OF OPENING

DIFFRACTION THROUGH AN OPENING: VARYING WAVELENGTHS

CONSTRUCTIVE AND DESTRUCTIVE INTERFERENCE IN TWO DIMENSIONS

NODAL LINES AND THE INTERFERENCE PATTERN

MATHEMATICAL ANALYSIS OF A TWO POINT SOURCE INTERFERENCE PATTERN

AND MANY MANY MANY MORE.... reading this information and learning it will definitely get you 100% on the upcoming test ( though results may vary.) That last bit was a bit of a giant contradiciton, but lets just keep the super physics blog rolling shall we?

The main point of varying wavelengths when it came to sharp barriers was this....

BIGGER WAVELENGTH + SHARP BARRIER = MORE DIFFRACTED (BENT)

Cant put it much more simply than that you guys.

The main point for us to learn out of diffraction through an opening: varying size of opening was fairly simple too....

SMALL OPENING + WAVE = MORE DIFFRACTION (BENDING OF WAVE)

BIG OPENING + WAVE = LESS DIFFRACTION

Once again in Diffraction through an opening, this time the size of wavelngth being the variant factor.... the lesson is simple again, borrowed from our sharp barrier equation i dispalyed earlier:
BIGGER WAVELENGTH + OPENING = MORE DIFFRACTED (BENT), In order for any significant diffraction to be noticed, the ration wavelngth/size of opening should be about (or greater than) 1.

Next we delved into the delightful ( though not as complicated as it appears) world of INTERFERENCE IN 2D!!!

So my badly scanned diagram shows that cosntructive interference can occur between two crests (represented by solid lines) and two troughs (represented by dotted lines). These produce antinodal areas. If you were to look at it from above... the double troughs would be blinding and the crests would be mad dark.... pretty much. Nodal lines are formed where crests and troughs intertwine to form nodes.

Each side of either of the perpindicular bisector of the distance between the two sources has symmetrical nodal/antinodal lines like so:

After this we learned about how we can determine the wavelngth of a wave in 2D using any point on a nodal line and its distance to the vibrating sources via the formula P1S1-P1S2= (n-1/2) wavelength. An example coyuld be that your point was 12 cm away from source one and 6 cm away from source 2. It is located on the 2nd nodal line.

Your equation would work out like this .... 12cm - 6cm = (2-1/2) wavelength

6cm= 1.5 (wavelength)

wavelength = 4cm

Hopefully that makes sense to you guys and sorry about all hte delay on this and what not haha.. as you can tell througout this post I became deadly tired and am now off to a nice rest in a warm comfy bed to prepare for tomorrows wonderful school day. Thank you again to Mrs. K who let me do this thang... I appreciate more than I can say. I truly do. Oooo next scribe.... Sorry bout this but I'm gunna have to pick the_bdl... Please don't hate me :p anyways bye for now fellow physics lovers!

Haha Epic Fail of a post....

Hahaha good evening to you all fellow 6th period Grade 11 Physics members... My blog was intended for Friday but me being the oh so attentive individual that I am... I was totally oblivious to this until a couple of hours ago ( thanks to a very awesome classmate, this was brought to my attention).

So now here I was, scrambling to remember all of this stuff and I came to another sad realization- I was completely lacking in my supplies. Thus I have come to a conclusion (which hopefully Mrs. K will find satisfactory) I will make sure to have all my supplies for blogging here tomorrow and will do a super post combining both what we did on Friday with what we will be doing tomorrow. Brilliant idea right? Really hope this flies.... so sorry everyone who counted on me... i failed you.... hopefully tomorrow I will be able to shine again for you all as a beacon of guidance in this glorious subject.

~~Matt~~

September 25, 2008

Hey-o everyone!

Okay, here I am listening to tunes and procrastinating on my English project, all the while wondering what to write in this blog post... Sorry I can't compare to the awesome blogposts already made, I will try not to fail you all!

How about summarizing what we did today? Well, we didn't do much actually. We watched a video on the smartboard that was quite entertaining and informative. We also had to complete a worksheet while watching said video. The worksheet was pretty straightforward since the answers were easily derived from the video. (Don't worry, don't worry, I'll post the worksheet with the answers in a bit...)

The video was mainly about the reflection of light through/off of different mediums. I'd come up with some analogies for the concepts but I wouldn't be able to do the video justice. Gah! I wish I could just find the darned video.

Now here is the worksheet. I apologize for my horrid penmanship and diagrams (oh and my scanning isn't very good but oh well!) D: !!



1) Anywhoots, first we learned how to find the shortest distance light would travel between two points. This is done by drawing a B-prime (an imaginary point beyond the barrier, mirroring the actual point) and connecting it to point A. The point where point B-prime crosses the barrier is the point where point A and point B should meet, thus resulting in the shortest distance to travel. The same applies for question 2.

2) Read my lengthy paragraph above.





3) This is relatively straightfoward. We've been repeating this concept for the past... week? So yeah! The angle of incident = the angle of reflection.

4) Okay, we can compare this to a page in a book because the book's surface is rough, not smooth. If it was smooth, the light rays would reflect much like light would off of a mirror, thus we'd only be able to see the contents of the book at (a) certain angle(s). The rough surface allows the rays to be reflected at different angles which allows us to view the page from any angle. (Hopefully I explained this well enough!)

5) This is similar to the first and second question~!

Okay, since the answers for the rest of the worksheet are easily explained through the context in which it is found, I feel that I don't need to explain anymore. (Plus, I need to get crackin' on my English project D: )

All in all, the video provided new viewpoints for the concepts we are learning, making it easier to understand. I learned and relearned a couple of things. (I mean come on! I had no idea a polar bear is black with white fur :O who'da known? Hahaha!)

Alas, after the video, we corrected the worksheet and attempted to correct a previous assignment... "Refraction - Light." We only got two questions corrected so I shall leave that entirely up to the next scribe... Which just so happens to be...

Super Captain Awesome of Extreme Fantasticness!
(C'man, a pseudonym like that should've drawn attention LONG ago!)

adieu~ ♥!

Wednesday September 24, 2008

Hey! Hey! Hey! Everybody! I hope you had a happy Wednesday!

Today in physics we did a lab and it was supposed to further your understanding of how light waves can BEND! So if you weren’t in class today (shame on you), you can probably read the rest of this post and do the little experiment at home. ;)

What you need: A ruler, a sheet of graph paper, a semi-circle dish thing, a marker, water

The Steps: (hopefully I remember right...)

Step 1: With your pencil, draw a line dividing the paper in half.

Step 2: Trace the outline of the semi-circle dish and make sure the flat side of the dish is on the line you just drew.

Step 3: With a marker draw two vertical lines on the side of the dish; one line in the middle of the flat side and one on the middle of the curved side.

Step 4: Place the dish back on the paper in the outline you drew of it and mark where the vertical lines are on the dish on the paper.

Step 5: Fill the dish about halfway with water.

Step 6: Bend down so your eyes are level with the dish full of water. Look for the vertical line you made and with your ruler draw a line in the direction of the mark. Do this four or five times, then repeat on the other side...

...Then fill out the Lab Worksheet... that I’m sure is worth marks...

So basically the gist of this activity was for you to analyze how the light bends and I’ll give you a hint if you’re stuck trying to analyze the bend of the light waves: one side of the dish refracted the light more than the other. ;) (I think... ha ha)

Class was fun today even though I probably screwed this activity up XD

The next scribe is miruiz.

The scribe for Wednesday is annabanana

I was supposed to be the scribe Monday, but I was not here, so I will scribe for both Monday and Tuesday today.

We watched a movie and received a couple of worksheets. We learned about Snell's Law for water waves, which allows us to calulate the angles, speeds and wavelengths associated with refraction. The equation was sinθi/sinθr = λi/λr = inr , where the symbols "i" and "r" refer to the incident wavefronts and rays and the refractive wavefronts and rays respectively. The ratio is always constant and this constant is referred to as the index of refraction.

Remember, when water waves move from one depth to another, the frequency of the waves does not change, but the speed and wavelength does. We use vdeep/vshallow = λdeep/λshallow to determine the speeds and the wavelengths. When a wave moves from deep water to shallow water, the speed and wavelength decreases while the wave ray is refracted towards the normal; when a wave moves from shallow water to deep water, the speed and wavelength increases while the wave ray is refracted away from the normal.

~Katherine

Hey guys, here's the scribe for last Friday.

We went to the pep rally.

The next scribe is Katherine.

.:. WAVES IN TWO DIMENSIONS introoo .:.

Hello everyone- Wazzup? [or if you prefer...what's going DOWN, pardon the random wordplay. I'm really bored.] :D I'm scribe today... pretty short notice really. But I'm coping. **sigh** just kidding though. I'm not really that burdened, "weblogging" isn't so baaaaaad. (bah. I have now transformed into a sheep. bah.) Anyhow, not to derail everyone from the TRAIN OF THOUGHT, here's my little abridged version of what happened in our very dynamic physics class. I'm being sincere. The class is dynamic.. you just get a sarcastic tone because this is text. No joke. The class is 'awesometown'.

After recently recovering from our first nerve-wracking test [which was not dreadful,] we started on a new subunit... of the unit which is: WAVES IN TWO DIMENSIONS. For those who took initiative and started looking at the blue booklet last night, the concepts were pretty easy to grasp. As for those who didn't? Well, not much difference there, we read sections C to F aloud after of course doing an exercise sheet that involved the concepts of section B mainly, allowing me to segue into...

OUTLINED POINTS IN B: WAVEFRONTS AND WAVE RAYS

• Initially, as an example, it is mentioned that waves may occur in different SHAPES and SiZeS. ex. Matter touching the surface of water creating a rippling effect like so:

• WAVEFRONT: A continuous crest or trough.
• WAVE RAY: lines that represent the transmission [direction of travel of a wavefront]
• NOTE: Wavefronts are always perpendicular to wave rays. **

In case you missed the answers to the sheet, here they are [including some notes taken]:

FRONT and BACK:

http://flickr.com/photos/25045230@N03/2868639851/sizes/l/

http://flickr.com/photos/25045230@N03/2868640021/sizes/l/

Sorry if the handwriting is illegible.

REMINDER: Answering these on the SmartBoard today, the common mistake was not putting arrows on the wave rays since they indicate direction. 

After that, we read the next few sections in the blue notebooks...

C & D: REFLECTION FROM A STRAIGHT BARRIER: WAVEFRONTS and WAVE RAYS

Straight waves travel towards a barrier and is reflected back along it's original path, only if approaching the barrier on a right angle. If incident waves approach the barrier on an angle, the rays are reflected on an angle as well. The angles involved is the angle of incidence and the angle of reflection. These angles correspond to each other, and are equal to each other. 

[θ_i = θ_r ].

Using wave rays, the main difference is that the angles of incidence and reflection are measured relative to a NORMAL.

NORMAL: straight line perpendicular to the barrier and is usually represented by a dashed line.

As for the last section we ended on today, I'm still trying to grasp the idea, so I don't think I can explain it yet. But the main thing was acting as if there was a virtual image of a circular wave on the other side of the barrier. From what I saw from the diagram, as soon as the circular wave makes contact with the barrier, the end seems to flatten and make corners, and result in a crescent shape. This crescent shape is made as if another circular wave was pushing it through the barrier, as shown in the diagram in the booklet.

There you have it, my lengthy and probably really tediously boring scribe post. There won't be a class tomorrow due to the pep rally. But the next randomly selected scriber is...Not Paul May the force of the blog be with you. 

and finally... DON'T FORGET Assignment one on this subunit is due...TOMORROW? or Monday, I'm not quite sure, since the pep rally will be taking over our class time. Until then, I'm dunzo. ;)

More of physics with Niwatori-san

Yesturday we had a physics test and hopes all of you classmates study study study hard! (just kidding) Well our physics test was on the unit we've been learning.

You kids just needed to read the booklet on "waves on 2 dimensions " getting an idea for the unit. You know, knowing a little before getting to know it more. -_- anyways

have fun studying in the future Niwatori-san signing off "GAMBETE!!!" (translation "Go for it!")

next scriber is J + Me

Have fun now :P

September 16, 2008

hey guys...i guess its finally the time for the hero to emerge in this blog to write the post...anyways, this is what we did in class:



First, class started a little late due to a lock down...i have an idea of what happened, but I'm not sure if it's true or if I'm allowed to say what i think happened on this post. Once class started, we corrected questions 7-14 in the blue booklet, which were assigned...at an earlier time...There was a lot of drawing involved, so if you want to check your answers, you should go check with a fellow classmate in order to ensure success in the test tomorrow, because I'm not so good at paint. We also handed in the 25-3 sheet (the sheet where we needed to draw constructive and destructive interferences between 2 waves and the ultimate wave on the back). We also went over the wave characteristics worksheet that i believe was assigned yesterday. Seeing as there are no drawings involved, i shall post the answers.



1) a) 0.0165 m b) 16.5 m

2) 2.9 m

3) 922000 Hz

4) 12 m/s

5) a) 8 s b) 0.125 Hz c) 16 cm d) 2 cm/s



If you're having problems with the...problems i suggest you go ask a friend for help before the test tomorrow.



Nearing the end of class, we were given another worksheet. This worksheet was titled: 18 transparency worksheet - wave properties. In this worksheet, we basically learned the properties of transverse and longitudinal waves as well as compare the two with each other. I was zoning out while we were correcting the answers, but i think i was able to get some correct. I believe the answers go as follows:



1) transverse and longitudinal/compressional waves

2) longitudinal/compressional waves

3) transverse wave

4) they are displaced parallel to the direction

5) transverse wave

6) compression can be compare to a crest, and rarefaction can be compared to a trough

7) transverse - crest to crest / trough to trough

longitudinal - compression to compression / rarefaction to rarefaction

8) the wavelengths are equal

9) the size of the compression or rarefaction

10) longitudinal/compressional wave



If some of the answers i posted up were wrong, then i apologize.



Finally, at the end of class, we did a little review of what will supposedly be on the test. I'm not sure if i caught everything, but some of the things i heard include waves (duh), movement of waves through different mediums, partial reflection/transmission, nodes (parts of a wave that doesn't move), and anti nodes (the high and low points of a wave). Just in case, though, i suggest you study everything we learned up until now for the test tomorrow.



This concludes my summary of the class for today, if you have any questions please do no hesitate to ask the teacher as well as some of my friends (including Karen, PJ, Mary, Pacifico, and maybe even Roger). You might as well ask everyone in our class. Well, that's all for now.



Bye Folks!

BTW the next scribe will be Niwatori-san!

15 September 2008

Hi .. haha
So, my name is Karen, and I am your scribe for today. . (thanks Roger -_-)

Today, we went over the Chapter 14 Study Guide. We corrected, and went over: Types of Waves, The Measures of a Wave: Frequency, Wavelength, and Velocity, Amplitude of a Wave, Waves at Boundaries Between Media, Superposition of Waves, and Standing Waves. We didn't go through the last three topics because Ms. Kozoriz said that it will be in our next lesson/unit or yeah.

---------------

Just in case you missed some, here are the answers
TYPES OF WAVES
mechanical
material
electromagnetic
no
particles
matter
three
perpendicular
motion
parallel
motion
surface
parallel
perpendicular
single
continuous
vibrating
harmonic

THE MEASURES OF A WAVE: FREQUENCY, WAVELENGTH, AND VELOCITY
shortest
motion
vibrations
second
Hertz
Hz
Hertz
f= 1/T
T
f
wavelength
λ
high
low
v= fλ or v= λ/T

AMPLITUDE OF A WAVE
maximum
equilibrium
more
energy

WAVES AT BOUNDARIES BETWEEN MEDIA
amplitude
frequency
properties
equal to
equal to
incident
transmitted
energy
reflected
most
little
inverted
erect
frequency
speed
wavelength

SUPERPOSITION OF WAVES
independently
displacement
sum
displacement
superposition
the same
larger
shape
size
opposite
zero
destructive interference

STANDING WAVES
undisturbed
destructive
displacement
constructive
standing
stationary
standing still


----------


Ms. Kozoriz also went over the difference between Low Frequency Waves and High Frequency Waves and she also talked about the difference between High Amplitude and Low Amplitude. I think she's hinting that they're going to be on the test. *wink, wink, nudge, nudge* yeah..

So, the difference between High Frequency Waves and Low Frequency Waves...



High Frequency Waves have more pulses per second, and they also have shorter wave lengths than Low Frequency Waves.





HIGH AMPLITUDE vs. LOW AMPLITUDE


Well the difference is obvious. High Amplitude Waves, has higher amplitude and Low Amplitude Waves has lower amplitude. Easy right? Ms. K also pointed out that High Amplitude produces a louder sound.



WAVES AT BOUNDARIES BETWEEN MEDIA








I'm not sure if the animation is working, but heres the link to the site where i found it. The site also explains what happen to the pulse as it moves from a less dense medium to a more dense medium.

CLICK (:



SUPERPOSITION OF WAVES
Well, I found videos which shows what happens during Destructive Interference and Constructive Interference





DESTRUCTIVE INTERFERENCE
- This occurs when the wave displacements are in opposite directions.
- The displacement produced when the two pulses meet is zero.





CONSTRUCTIVE INTERFERENCE
- Occurs when wave displacements are in the same direction.
- Results in a wave with a larger displacement. (sum of the displacements that would've been produced by each wave independently)



STANDING WAVES





Yeah.. I'm not done yet.
According to the study guide, "When two waves meet, a point in the medium that is always undisturbed by the wave is called a node" Nodes are produced by destructive interference.
An antinode on the other hand is produced by constructive interference, and again according to the study guide ;) "it is the point in the medium where there is the greatest displacement"
In a standing wave, the nodes and antinodes are stationary, and the wave appears to be standing still.







So, after we finished correcting the study guide, Ms. K gave us two worksheets
Wave Characteristics and Wave Superposition.
Wave Superposition is to be handed in tomorrow. And we're also going to go over questions 7-13 from the blue booklet.

TEST ON WEDNESDAY ! D:

yuuuhp. sorry about the long, boring post.

Next scribe is..
Mr. Jonathan Paguia (:

Friday, September 12, 2008

Hey everyone, sorry for the late post i have been very busy. Anyways, heres an overview of class on friday.

at the beginning of class we started off listening to a song about wave motion called, Wave motion. I guess it's just a different way to understand the concept. Personally, putting physics into song just doesnt work for me. well after that, we went over questions 1 to 6 in the blue booklet, waves in one dimension. After going over the questions, Mrs. Kozoriz gave time to anyone that did not finish the study guide about wave properties given the day before. She also assigned the rest of the questions (questions 7 to 14) in the blue booklet which is due on Monday.

ALSO, test on wednesday!! i think..
and the NEXT BLOGGER IS KAREN!

Sept.11/08

Good morning guys! sorry about the late blog, there was a little confusion on to who was the next scribe. i'll try to condense everything, so there isn't much to read over. bare with me and my lack of spelling/grammar. either way, here it is!

during the previous class, we had a substitute who went by the name mrs.hodgson. she had assigned us two sheets,"chapter 14.1-2 study guide", related to pages 288-301 in the text book. The sheets were basically fill in the blanks and were fairly simple. (if you read closely to the text from the text book). It had topics such as Types of Waves, The Measures of a Wave, Amplitude of a Wave, Wave interference, superposition of Waves. Standing Waves, Reflection of Waves, Refraction of Waves, and Diffraction of Interference of Waves.

The substitute was hinting at a quiz or test, because of the title "study guide". i'm not too sure if this coming test/quiz is ture or not, but its better to have finished the sheets. right?

i'll add more info on the topics after school, because i need to leave for cross country practice. (can I do that? LOL sorry!)


Next scribe is ROGER, bye bye!
Mary (:

Scribe Wednesday, September 10th

hey gangsta's this is kale doin' his first scribe

well in class today we started off by taking attendance then shortly after we corrected the 4 worksheets that were assigned on monday, i hope everyone did well, i myself got almost everything correct.

anywho, after that we were assigned to read parts D, E and F (pages 5,6 and 7) in our blue note booklet, then do questions 1-6 on page 12. I will summarize parts D, E and F for you guys.

Part D: Reflection
This part explained how when a pulse hits a wall, it comes back the other way. Here is a simple diagram explaining it.



















(Okay dude, underline went on and i dont know how to take it off, so yeah)
anyways it's a pretty easy concept to grasp, you just gotta know that when the pulse hits the wall it exerts a force upward on the support, which then exerts and equeal (but opposite) force down. This force makes the inverted pulese.

When There is no barrier, the rope's pulse will reflect on the same side, like so.



nice, its not underlined anymore
anyways the rope is free, so when the pulse reaches the end the particles exert an upward force, sendin' the pulse back as an imcoming pulse.

E: Wave Transmission in Two Media
The speed is constant when a pulse travels through a medium, but if two different mediums were connected and had different densities, the speed would change abruptly. Frequency will not change as it is a constant. The equation v=fλ shows how to calculate this change.
An example would be connecting a light rope to heavy rope, the wavelength and the speed would decrease, and vica versa =]

F: Wave Transmission and Partial Reflection in Two Media
on the connection between to media, some reflection may occur, this is called partial reflection. Some energy is reflected back to the first medium, and some is transfered to the next. There is no change in speed, wavelength and frequency in the reflected pulse.


here is a little example i cooked up, it just shows the inverse pulse reflection

When a wave goes from a big rope to little one, there is no inversion, but still some reflection.
The littler rope acts like a free end, but its not quite.




When moving from a large to small rope the pulse moves faster and has a greater wavelength, but isnt inverted

there it is, my first post (try to ignore some typos and/or grammatical errors

September 9, 2008

Hello everybody! It's my turn to scribe so here is what we did today!

In today's class we did a lab called, "Waves on a Snakey." The purpose of this lab was to investigate properties of waves using a snakey (slinky) as a model. After Mrs. Kozoriz explained what we were going to do, she distributed the materials we needed and we broke into groups and got started. The entire class was spent with everyone crouching on the floor and watching in amazement as two people stretched the slinky, and by making quick sideways snaps with our wrist, we created the waves that traveled down, hit the other side, and reflected back. While doing so we had to observe the waves and think about what was happening to the amplitude and the speed of it as it traveled. My group didn't have much trouble, although we debated whether or not the pulse did in fact bounce off each other or pass through. We did ponder on what the meter stick and stop watch was used for, but other than that everything was fine.

Along with this lab we were given a worksheet that should be completed and handed in TOMORROW! And.. I think thats it. I don't know what else to put so I'll end it here.

The next scribe was picked by random so congratulations 'kaleiscool'! You're next! Have fun!

September 8, 2008

-Piisu~!
...
...
LOL

Anyways...

Deadline:
Job ad that needs Physics or something like that

Today, we started the unit about Waves by learning about Waves in One Dimension.

Vocabulary:

• continuous/periodic wave: a wave that is made by a disturbance that is moving back and forth periodically, i.e. the source is oscillating or vibrating.
• transverse wave: the particles of the wave vibrate up and down while the direction of motion is to the left or right.
• crest: high point on a wave.
• trough: low point on a wave.
• amplitude (A): maximum height of a crest or depth of a through from the equilibrium level (rest position).
• cycle: one complete oscillation (one complete up and down movement in the case of a transverse wave).
  
• wavelength (λ): horizontal length of one cycle of the wave; can be described as the horizontal distance between two successive crest/through or any successive equivalent points on the wave.
  
• longitudinal wave: the particles of the wave vibrate the same direction as the motion of the wave.
• frequency (f): number of cycles that pass a given point per unit of time; commonly measured in cycles per second or hertz (Hz).
• period (T): time elapsed between two successive crests/troughs/equivalent points passing by the same point in space.
• wave velocity (v): velocity at which the wave moves.
  
• longitudinal wave: the particles of the wave goes the same direction as the motion of the wave.
  
• compression: areas in a longitudinal wave that are momentarily close together.
• rarefactions or expansions: areas also in a longitudinal wave that are momentarily far apart.

Formulas to remember:
T = 1/ f
v = λ/T
v = f * λ
f = 1/T

Assignment:
Periodic and Frequency Problems Sheet
Vibrations and Waves Sheet
Characteristics of Waves Sheet
ALL DUE WEDNESDAY

Well... That's it...
Next scribe is arielle!

September 5th, 2008

Hey everybody, this is Daniel, and here's a quick breakdown of today's class.

We looked over the "Paper Tower" challenge, and after Ms K went over the ground rules, we got building. While at times it looked like it was anyone's game, by the end of class, Katie Ann and myself had clearly topped the competition. Our tower may not have been pretty, but it had an organic quality that Kale appreciated, comparing it to many an inappropriate thing.

I would like to take this time to congratulate everyone, because like Ms K said, We're all winners.

Scribe List

This is The Scribe List. Every possible scribe in our class is listed here. This list will be updated every day. If you see someone's name crossed off on this list then you CANNOT choose them as the scribe for the next class.


This post can be quickly accessed from the [Links] list over there on the right hand sidebar. Check here before you choose a scribe for tomorrow's class when it is your turn to do so.

Shasta MOOffatt Not Paul

Jeamille Wonderbread

Katherine