Question

If the power of a light source is P & frequency of photons emitted is f. Find number of photons emitted in time t

(1) \(\frac{Pt}{2hf}\)

(2) \(\frac{Pt}{hf}\)

(3) \(\frac 12\frac{Pf}{ht}\)

(4) \(\frac{Pf}{ht}\)

Answer 1

Correct option is (2) \(\frac{Pt}{hf}\)

\(Pt = nhf\)

\(n =\frac{Pt}{hf}\)