Q.

Consider two light sources of wavelength λ1 and λ2 λ1>λ2  which are emitting n1 and n2 photons respectively, in a given time.Assume equal power for both the sources, then

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a

n1 > n2

b

n1 < n2

c

n1 = n2

d

None of the above

answer is A.

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Detailed Solution

Power=Energytime=n1hcλ1Δt=n2hcλ2Δtn1n2=λ1λ2as λ1>λ2⇒ n1>n2
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Consider two light sources of wavelength λ1 and λ2 λ1>λ2  which are emitting n1 and n2 photons respectively, in a given time.Assume equal power for both the sources, then