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Let nr and nb be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in a given time.

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Let nr and nb be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in a given time.

(a) nr = nb. 

(b) nr < nb. 

(c) nr > nb.

(d) The information is insufficient to get a relation between nr and nb.

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(c) Red bulb and a blue bulb of equal power in a given time nr > nb.

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