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Question

# If nR and nV denote the number of photons emitted by a red bulb and violet bulb of equal power in a given time, then:

A
nR=nV
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B
nR>nV
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C
nR<nV
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D
nRnV
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Solution

## The correct option is B nR>nVPhotons are the packets of energy (or energy particle) which are emitted by a source of radiation.Energy possessed by a photon is given byE=hv=hcλIf power of each photon is P, then energy given out in t second is equal to Pt. Let the number of photons be n, thenn=PtE=Pt(hc/λ)=PtλhcFor red light, nR=PtλRhcFor violet light, nV=PtλVhc∴nRnV=λRλVAs λR>λVSo, nR>nV

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