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sushant RAJ Grade: 12
        

a metallic sphere of radius R is kept in the path of a parallel beam of light of intensity I.the force exerted by beam on the sphere (where c=velocity of light & metallic sphere absorbed all light.


 

6 years ago

Answers : (1)

Aman Bansal
592 Points
										

dear sushant raj,


momentum p= u/c, u=energy & c= velocity of light,


 I= U/A , a= area


for the sake of simplicity we are taking area A to be  ΠR2


therefore u= I*A=I*pi *R2


=> p = I*pi *R2/c


and f=dp/dt


considering that light strikes for a small time interval of delta t


therefore F= I*pi *R2/c*deltat


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aman bansal

6 years ago
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