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[" 13.How many photons are emitted per s...

[" 13.How many photons are emitted per second by "5mW" laser source operating at "632.8nm?],[" 1) "1.6times10^(16)quad " 2) "1.2times10^(16)quad " 3) "1.5times10^(19)quad " 4) "1.6times10^(3)]

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