comment

i agree that we learned about waves and frequency....i believe that the pre-quiz is a good guide to what the quiz is gona b on

weekly blog

So, I just finished the quiz, I did't think it was that bad, but there were some things that I didn't know. A couple of questions seemed new, like we hadn't done things like that in class. That seems to happen often with these quizes, that some of the questions are new and random. Its kind a of aggrevating if you do the practice stuff, and then stuff that isn't on those review sheets are on the quiz.

Waves Part II

Yesterday in class we continued learning about waves. We learned about standing waves, which travel in the same medium, have the same frequency and amplitude, but travel in oppisite directions. We watched a video clip and saw some demonstrations to further explain this concept. I think that maybe just one or the other, the deomstration or the video would have been enough, both was kind of over kill and just seemed repetitive.

Then we learned about diffratcion, which is what happens after a wave hits an obsticle, like a wall with a break in it. After it hits the wall, the wave spreads out behind it. Once again, the picture were helpful here, but the video seemd a bit redundent. I think its good to break up notes every once in a while, but too many videos makes the lesson kind of chopping.

Finally we learned about resonance, which is the amplitdue of an object's ocialtion at or near its normal frequency. Once again we were given exaplmes to better understand the concept.

Waves Doppler Effect

In class we leared about Waves and The Doppler Effect. The Doppler Effect is a varation in the frequency when there is relative motion between the source of the frequency and the observer. If the source is approching there will be a higher frequency and if it is Receeding there is a lower frequency. An example of The Doppler Effect is the fire truck siren, which was talked about in class.