Question: A photocathode has a work function of 2 . 4 eV . The photocathode is illuminated with monochromatic radiation whose photon energy is 3 .

A photocathode has a work function of 2.4 eV . The photocathode is illuminated with monochromatic radiation whose photon energy is 3.9 eV . The wavelength of the illuminating radiation is closest to:
A photocathode has a work function of 2 . 4 eV .

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