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PHY P2 HELPPP PLZZZZ!!!!!!!!!

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can sum 1 plzz help me in these ques...
jun 03, Q4(b)'s sec part...cant understand about da brightness
jun 05, Q4(b);s third part
thnx in advance!!!
 
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MJ 05 4b (iii)
max strain energy = area under graph.
SE = 1/2 Fx
= (1/2) (60N) (3X10^-4)m
= 9 X 10^-3
 
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brightness depends on the amount of light passing through the slits or the intensity of light. If the slit size increases , it will allow more light to pass through and hence fringes will be brighter...
and increasing the intensity of light will definitely increase the brightness of the bright fringes but will have no effect on dark fringes.
 
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