A 200 W sodium street lamp emits yellow light of wavelength
0.6 μm. Assuming it to be 25% efficient in converting
electrical energy to light, the number of photons of yellow
light it emits per second is
(a) 1.5 × 10²⁰ (b) 6 × 10¹⁸
(c) 62 × 10²⁰ (d) 3 × 10¹⁹
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