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Physics Paper4

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Sue T:

--- Quote from: thecandydoll on May 10, 2011, 12:51:46 pm ---i have come across certain places that 2*E(kinecticenergy) =  change in potential energy?
howww?

--- End quote ---
i can only help you if u specify where and what u saw ;) but in general energy is conserved  so ek lost=ep gained

thecandydoll:
october/n 2008 q5 a

Sue T:

--- Quote from: ruby92 on May 09, 2011, 07:55:55 pm ---O/n2006 7b
M/j 2007 Q3 d

--- End quote ---
so if you increase the frequency, the wavelength decreases.Wavelength affects the number of photons per unit time so a dec in this means a dec in that. intensity remains same. dec in the number of photons per unit time means a derease in the number of photo-electrons per unit time which is the rate of emission.
keep in mind also an inc in frequency means an increase in th max kinetic energy of the photo-electrons but this is not required in this answer ;)

now mj2007 3d - see the more the electric feild strength, the larger th force ryt? and force is directly proportional to acceleration so for part (i) put it as d=o cuz thats the highest value for E. Then part (ii) put it as a description of E. as in go like >> it decreases and then increases -simply . Now wat would be wrong here is putting in a description of the gradient of the graph wen describing the acceleration - because the gradient of that graph is something else - not a quantity proportional 2 acceleration.

TJ-56:
October\November 2004 Q3 (c) (ii) How is the new amplitude of 4.5 cm calculated?
Thanx in advance

Sue T:

--- Quote from: TJ-56 on May 10, 2011, 01:43:34 pm ---October\November 2004 Q3 (c) (ii) How is the new amplitude of 4.5 cm calculated?
Thanx in advance

--- End quote ---

okkkkk sooooo E directly proportional to A2
E ---------> A2
15x10-3-------->(5x10-2)2
(80/100)15x10-3----------->a2

15x10-3 . a2 = (5x10-2)2 . (80/100)15x10-3

do the math im tired now  ::)

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