Question

Consider a sphere of radius R exposed to radition of instensity I as shown in figure . If surface of sphere is partially reflection and reflection coefficient is 0.3, then radiation force experienced is :

A. `(pi R^(2)I)/(c)`
B. `(1.7pi R^(2)I)/(c)`
C. `(0.3pi R^(2)I)/(c)`
D. None of these

Answer 1

Correct Answer - 4
`F=dp`
`(1)/(c) = n(h)/(lambda)`
effective area `= pi R^(2)`
`F= 1.3 pi R^(2)(I)/(c)`