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If phtotlectrons are to be emitted from ...

If phtotlectrons are to be emitted from a potassium surace with a speed of `6 xx 10^6 ms ^(-1)`,what frequency of radiation must be used?Give that threshold frequency for potassium is `4.22 xx 10^(14) H z,h = 6.6 xx 10^(-34) J s` and `m_e = 9.1 xx 10^(-31) kg`.

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