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A metal target is irradiated with UV light at 240 nm. Electrons are emitted and they...

A metal target is irradiated with UV light at 240 nm. Electrons are emitted and they have a broad range of kinetic energies up to a maximum value of 0.75 eV. The experiment is restarted, this time beginning with a wavelength of 500 nm. The frequency of the incident light is increased until the metal just begins to emit electrons. What is this threshold frequency and corresponding wavelength?

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