1.

A bulb of 40 W is producing a light of wavelength 620 nm with 80% efficiency. Find the number of photons emitted by the bulb in 20 seconds. (1 eV=1.6×10−19 J, hc=12423 eV oA)

Answer»

A bulb of 40 W is producing a light of wavelength 620 nm with 80% efficiency. Find the number of photons emitted by the bulb in 20 seconds.
(1 eV=1.6×1019 J, hc=12423 eV oA)



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