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 × 1020. The value of x is________.
[Given: h = 6.63 × 10-34 Js and c = 3.0 × 108 ms-1]
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 × 1020. The value of x is________.
[Given: h = 6.63 × 10-34 Js and c = 3.0 × 108 ms-1]
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1 Answer
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Power = 50 watt = 50 J/sec
Energy emitted per second = 50 J
Wavelength ;
Energy of one photon =
Number of photons emitted per second =
= 2 × 1020
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