The work function for aluminium surface 4.2 eV and that for
sodium surface is 2.0 eV. The two metal surfaces are
illuminated by suitable radiations so as to cause photo
emission. We observe that.
(1) Both A1 and Na will have the same threshold frequency
(2) The threshold frequency of A1 > that of NA
(3) The threshold frequency of Na > that of Al
(4) The threshold wavelength of Al > that of Na
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