Calculate the number of photons from green line of mercury (λ = 4961x10^-10m) required to do a work of 1J.
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N h c / λ = 1 J
N 6.624e-34 *3e8 / 4961e-10 = 1 J
N = 2496e15
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N 6.624e-34 *3e8 / 4961e-10 = 1 J
N = 2496e15
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