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AIPMT 2012 Physics and Chemistry Paper

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Question : 3 of 100

Marks: +1, -0

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

1.5×1020
6×1018
62×1020
3×1019

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