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[" Electrons from "n=2" to "n=1" in Hydrogen atom "],[" is made to fall on a metal surface with work "],[" function "1.2ev" .The maximum velocity of photo "],[" electrons emitted is nearly equal to "],[[" 1) "6times10^(5)m/s," 2) "3times10^(5)m/s],[" 3) "2times10^(5)m/s," 4) "18times10^(5)m/s]]

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