A 200 W sodium street lamp emits yellow light of wavelength

Last updated: 6/24/2023

A 200 W sodium street lamp emits yellow light of wavelength 0 6 m Assuming it to be 25 efficient in converting electrical energy to light the number of photons of yellow light it emits per second is AIPMT Prelims 2012 2 3 1019 4 6 1018 1 62 1020 3 1 5 1020