Let $n_{r} a n d n_{b}$ be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in a given time.

n_{r} = n_{b}

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n_{r} < n_{b}

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n_{r} > n_{b}

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Solution

The correct option is C $n_{r} > n_{b}$
As per the question, $n_{r} \times \frac{h c}{λ_{r}} = n_{b} \times \frac{h c}{λ_{b}} \Rightarrow \frac{n_{r}}{n_{b}} = \frac{λ_{r}}{λ_{b}} > 1$

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