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Question: A parallel beam of uniform, monochromatic light of wavelength 2640 Å has an intensity of 100 W/m<sup...

A parallel beam of uniform, monochromatic light of wavelength 2640 Å has an intensity of 100 W/m2. The number of photons in 1 mm3 of this radiation are –

A

(a) 222

A

(b) 335

C

442

D

555

Answer

442

Explanation

Solution

I = =

N = 100×10−9×2640×10−10(3×108)2×6.63×10−34\frac { 100 \times 10 ^ { - 9 } \times 2640 \times 10 ^ { - 10 } } { \left( 3 \times 10 ^ { 8 } \right) ^ { 2 } \times 6.63 \times 10 ^ { - 34 } }

442 photons/mm3