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physics doubt CIE

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astarmathsandphysics:
Will answer this when I get home

astarmathsandphysics:
Which paper are those questions from?

tmisterr:
Q 16 Power is Energy/time, which is the gradient of the graph. Gradient is highest between 2 and 3 seconds. gradient is change in y/change in x so 30/1 which is 30W so answer is C
Q 25 intensity is directly proportional to (Amplitude)2 so if you increase the intensity by 2, you also increase the Amplitude but by  square root 2 because of the above mentioned proportionality. answer is B
Q 32 Electric field strength=Voltage/distance between plates so 9/4*10-3 which is 2250, to the nearest hundred it is 2300 or 2.3*103. REMEMBER TO ALWAYS CHANGE mm into m.
Q 33 V=Area*length so lets say volume is Al. when you double the length (2l), you have to half the area (1/2A) so that 1/2A*2l=Al which is V (stays constant).  R=resistivity*length/Area so second wire will have 4 times the resistance so answer is D.

tmisterr:
lol sorry solved 30 instead of 32
Q32 each electron carries a charge of 1.6*10-19 so for a charge of 10C you need 6.25*1019 electrons to the nearest it will be 6.3*1019 answer is c

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