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Monochromatic light of frequency 6x109 H3 is produced by a lasere. The power emitted is 2x10 W. in light beam? an average, are emitted

Monochromatic light of frequency 6x109 H3 is produced by a lasere. The power emitted is 2x10 W. in light beam? an average, are emitted - (a) what is the energy of a photon (6) How many photons on by the source.

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