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de broglie's
when photons of energy (x) strike surface of metal A the ejected electrons have energy $ and wavelength #
the max KE of ejected electrons from another metal by another (B) by energy @ and wavelength is #'
and @ = $ -- 1.50 eV if (x = 4.25 ev) (y= 4.70ev)
if #' = 2#
then find work function of metal A B
find # or #'
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