Qualification > Sciences
CIE physics paper 2
Tyserius:
--- Quote from: kratos009 on November 17, 2009, 05:05:51 am ---I remembered that in a past exam they had asked the amplitude on a part of the wave which was in the 'negative zone' and they had answered it as negative amplitude. I think the question was asking the displacement of that particle at that instant, and considering displacement is a vector quantity it was necessary to give the it as negative amplitude. I'm not 100% certain but i'm pretty sure that's what you have to do.
Plus I don't really want to think too much into the physics paper, what's done is done. I still got my Chemistry to go :(. Lucky you tyserius you've finished :).
--- End quote ---
Haha yes yes I'm a lucky man. :D But in this case it's amplitude, I think it's just A. Bah who cares, it's already over xD Err I did the variant where the wave question had like L and the points are like 1/8L from respective ends.
highly_ambitious:
Hey, Tyserius even i did the same variant which u are talking about
Haha yes yes I'm a lucky man. But in this case it's amplitude, I think it's just A. Bah who cares, it's already over xD Err I did the variant where the wave question had like L and the points are like 1/8L from respective ends.
what was the frequency and phase difference for that question? I wrote 'f' for frequency and 45 deg. for phase diff. Is it correct?
AndrewCedric:
Yea.. its f for the frequency.. But not sure for the phase. I wrote 180 degrees which is supposed to be the correct one. No 45 is wrong. The possible options are 180 / 270 degrees. Of course only 1 answer is correct. Not sure which one it is.
efafa:
--- Quote from: highly_ambitious on November 17, 2009, 02:52:39 pm ---Hey, Tyserius even i did the same variant which u are talking about
Haha yes yes I'm a lucky man. But in this case it's amplitude, I think it's just A. Bah who cares, it's already over xD Err I did the variant where the wave question had like L and the points are like 1/8L from respective ends.
what was the frequency and phase difference for that question? I wrote 'f' for frequency and 45 deg. for phase diff. Is it correct?
--- End quote ---
frequency was f and phase difference i think was 1/2pi.
Tyserius:
--- Quote from: AndrewCedric on November 17, 2009, 03:33:46 pm ---Yea.. its f for the frequency.. But not sure for the phase. I wrote 180 degrees which is supposed to be the correct one. No 45 is wrong. The possible options are 180 / 270 degrees. Of course only 1 answer is correct. Not sure which one it is.
--- End quote ---
The answer is 1.5 / 270 degrees lol that's because you use the distance between the points / wavelength multiplied by 2
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