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.

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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


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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 (: