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Question

Monochromatic light of wavelength 3000A is incident on a surface area of 4cm2. If intensity of light is 150mWm2, then the rate at which photons strike the target is

A
3×1010s1
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B
9×1013s1
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C
7×1020s1
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D
6×1019s1
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Solution

The correct option is B 9×1013s1
λ=3×107m,A=4×104m2,I=150×103W/m2I=EA×t=nhcλ×At(nt)=IλAhc=150×103×3×107×4×1046.6×1034×3×108=9×1013s1

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