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The number of photons emitted in 10 hours by a 60 W sodium lamp (wavelength of photon = 6000 A) (A) 6.50 × 1024 (B) 6.40 × 1023 (C) 8.40 × 1023 (D) 3.40 × 1023 [Take hc = 12400 eVA, h = Planck’s constant, c = speed of light]
(A)
Sol. Let n be the number of photons emitted
=> (12400× 1.6 × 10–19 × n)/6000 = 60 × 10 × 60 × 6
=> n = 6.5 × 1024
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