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Monochromatic light of wave length 632.8nm is produced by a helium - neon laser. The power emitted is 9.42mw. Find the energy and momentum of each photon in the light beam

E=3.14×1019JP=1.05×1027kgms1E=3.14×1019kJP=1.05×1027kgms1E=1.05×1027JP=3.14×1019kgms1E=1.05×109JP=3.14×1027kgms1

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