A 200 W sodium street lamp emits yellow light of wavelength 0.6. Assuming it to be 25% efficient in
Channel: Ritesh Dahiya (RD Sir) (KDC) Kota Doubt Counter
Date: 2020-08-28

A 200 W sodium street lamp emits yellow light of wavelength 0.6. Assuming it to be 25% efficient in converting electrical energy to light, 

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