Calculate the number of photons emitted per second by 25 W source of monochromatic light of wavelength 600nm.
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E=n(hc)/Wavelength
If we want to know the number of photons emitted per second we must be knowing energy emitted per second which is given in the question (25 W => 25 joules per second)
=> 25 = n (1240/600)
=> n = 25×600
1240
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