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


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