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When a certain metal was irradiated wit...

When a certain metal was irradiated with light of frequency `4.0 xx 10^(19)s^(-1)` the photoelectrons emitted had three times the kinetic energy as the kinetic energy of photoelectrons emitted when the metal was irradited with light of frequency `2.0 xx 10^(16) s^(-1)` .Calculate the critical frequency `(v_(0))` of the metal

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