Monochromatic light of wavelength 3000∘A is incident on a surface area of 4cm2. If intensity of light is 150mWm−2, then the rate at which photons strike the target is
A
3×1010s−1
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B
9×1013s−1
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C
7×1020s−1
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D
6×1019s−1
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Solution
The correct option is B9×1013s−1 λ=3×10−7m,A=4×10−4m2,I=150×10−3W/m2∴I=EA×t=nhcλ×At⇒(nt)=IλAhc=150×10−3×3×10−7×4×10−46.6×10−34×3×108=9×1013s−1