A modern 200 W sodium street lamp emits yellow light of wavelength 0.6 `mum`.
Channel: Doubtnut
Date: 2020-08-02

A modern 200 W sodium street lamp emits yellow light of wavelength 0.6 `mum`. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of tellow light it emits per second is