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Question

What will be the number of photons emitted per second by a 10watt sodium vapour lamp assuming that 90% of the consumed energy is converted into light? Wavelength of sodium light is 590nm;h=6.63×1034Js

A
0.267×1018
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B
0.267×1019
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C
0.267×1020
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D
0.267×1017
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