A 200 W sodium street lamp emits yellow ...

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

`1.5 xx 10^(20)`

`6 xx 10^(18)`

`62 xx 10^(20)`

`3 xx 10^(19)`

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