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NEET 2012 Physics question

PhysicsDual Nature of Matter and RadiationNEET 2012

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

Answer: (2)

Solution

Power converted to light . Energy of one photon: . Number of photons

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Question ID VK-091274