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Physics paper 1 problems..

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superduper2009:
the frequency of uv rays vvaries from 10^15 to 10^17 Hz
the higher the wavelength the lower the frequency...
so we choose the least frequency..
which is 10^15=10^x
x=15

By the way u know how to answer q13,14

hesho21:
yeh question 13 if u hear the word equilibrium look for a closed triangle, which is R & S
q14 it says from the middle of the door so 12= F x 0.4 and u will get D

By the way u answered for me the wrong question ;) I meant number 23 not 22 ;)

superduper2009:
sorry wrong paper

and my question was wrong too :S
do u know how to answer q 13 , 14 in paper 11 oct 2009??

for q23 i can't see the indices of the mass ...
but anyways..u would require the formula ke = 1/2 mv^2

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