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A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons

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A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second by the bulb is x x 1020. The value of x is ...... 

[Given : h = 6.63 x 10–34 Js and c = 3.0 x 108 ms–1]

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1 Answer

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by (35.6k points)

Answer is (2)

Total energy per sec. = 50 J

n = 1998.49 x 1017 [ n = no. of photons per second] 

= 1.998 x 1020 

2 x 1020 

= X x 1020 

x = 2

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