Answer :

(i) Energy emitted by a photon = hν = (6.63 x 10-34 x 6 x 1014) J = 39.78 x 10-20 J = 2.49 eV, where h = Planck’s constant, ν = frequency.

(ii) Total power = 2 x 10-3 W(given)

Therefore, number of photons per second = .

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