.:. 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. ;)