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Calculate the number of photons emitted per second by a 10 W sodium vapour lamp.

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Calculate the number of photons emitted per second by a 10 W sodium vapour lamp. Assume that 60% of the consumed energy is converted into light. Wavelength of sodium light = 590 nm.

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P = 10 W  E in 1 sec = 10 J % used to convert into photon = 60%

Energy used = 6 J

Energy used to take out 1 photon

No. of photons used

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