Q23. A modern 200-watt 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:Physics — Dawn of Modern Physics — Question 23 of 217A. 6.2 × 1020B. 3 × 1019C. 1.5 × 1020D. 6 × 1018Practice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →