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There are n1 photons of frequency γ1 in a beam of light. In an equally energetic beam, there are n2 photons of frequency γ2 . Then the correct relation is 
(a) n1n2=1                        (b) n1n2=γ1γ2
(c)  n1n2=γ2γ1                     (d) n1n2=γ12γ22