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Q.

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
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