When a light of wavelength 420nm is focused on a metal surface, electrons are ejected with a speed of 7.00x10^5 m/sec. The binding energy of a mole of electrons to the metal is...?
Answer:
Figure out the energy of the incident radiation using E = hc / lambda.
Figure out the energy of the ejected photoelectron using E = m (v squared).
The difference is the binding energy per particle. Now multiply by N to get the molar BE.
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