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If photoelectrons are to be emitted from a potassium surface with a speed of `6 xx 10^(6)ms^(-1)`, what frequency of radiation must be used ? (Threshold frequency for potassium is `4.22 xx 10^(14) Hz, h = 6.6 xx 10^(-34) Js` and `m_(e) = 9.1 xx 10^(-31) kg`)

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