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Question

A laser beam λ=633 nm has a power of 3 mW. What will be the pressure exerted on a surface by this beam if the cross-section area is 3 mm2? (Assume perfect reflection and normal incidence).

A
6.6×103Nm2
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B
6.6×106Nm2
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C
6.6×109Nm2
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D
6.6Nm2
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Solution

The correct option is B 6.6×106Nm2
Pressure on surface if beam is perfectly reflected =2×Intensityc

Here, intensity of beam =PowerArea
=3×1033×106=103 Wm2

Pressure=2×1033×108=6.6×106 Nm2

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