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Each photon has ( h · f ) joules of energy.

( ' h ' is Planck's Konstant. ' f ' is the frequency of the radiation.)

In order to collect 1 mJ of energy from the radiation, you have to gather up

(0.001)/( h · f ) photons. ' h ' is Planck's Konstant, 6.63 x 10-34 joule-second.

' f ' is the frequency of the radiation, which is not given in the question.

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