Question

the number of photons emitted in 10 hours by a 60 watt sodium lamp will be

Answer 1

Energy of photon, E = hν = h(c/λ) = 3.374 x 10-19 J

[It is known that, h = 6.626 x 10-34m2 kg/s and c = 3 x 108 m/s]

Number of photons emitted by the sodium lamp in one second = [60 / 3.374 x 10-19]

∴ The number of photons emitted by the sodium lamp in 10 hours is

= [(60 x 10 x 3600)/ (3.374 x 10-19)] = 6.4 x 1024

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