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Question

# Solar radiation of intensity 1.5 kW/m2 is incident on a perfectly black surface, making an angle of 30∘ with the surface. What is the pressure experienced by the surface?

A
0.25×106 N/m2
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B
0.25×108 N/m2
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C
1.25×106 N/m2
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D
1.25×108 N/m2
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Solution

## The correct option is C 1.25×10−6 N/m2As it is a perfectly black surface, all the incident radiation will be absorbed. Angle made by the incident radiation with the vertical is, θ=90∘−30∘=60∘ The pressure experienced by the surface is, P=FcosθA=Iccos2θ =1.5×1033×108×cos260∘ =1.25×10−6 N/m2 Hence, (C) is the correct answer.

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