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Question

Consider a sphere of radius R exposed to radiation of intensity I as shown in figure. If surface of sphere is partially reflecting with reflection coefficient is 0.3, then radiation force experienced is


A
πR2Ic
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B
1.7πR2Ic
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C
0.3πR2Ic
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D
1.3πR2Ic
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Solution

The correct option is D 1.3πR2Ic
Given, reflection coefficient, α=0.3

The total radiation force acting on the sphere is,

FR=(1+α)IAc

Where, A=πR2=Effective area

FR=(1+0.3)IπR2c=1.3IπR2c

Hence, (D) is the correct answer.

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