5. Light of wavelength 390 nm is directed at a metal electrode. To find the energy of
electrons ejected, an opposing potential difference is established between it and another
electrode. The current of photoelectrons from one to the other is stopped completely
when the potential difference is 1.10 V. Determine i) the work function of the metal and
ii) the maximum wavelength of hght that can eject electrons from this metal.
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