Monochromatic light of wavelength 3000Ao is incident on a surface are 4cm2 . If intensity of light is 150mw/m2 , then rate at which protons strike the target is
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a
3×1010/sec
b
9×1013/sec
c
7×1015/sec
d
6×1014/sec
answer is B.
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Detailed Solution
I = nhνA = nhcAλn = IAλhc=150×10−3×4×10−4×3×10−76.6×10−34×3×108= 9×1013/sec