(b) The Taylor series for the exponential function is e x = 1 + x + x 2 /2! + ". (a) At high frequencies, we have ebν /T > 1 and the −1 in the denominator of Planck’s formula can be neglected to give Wien’s formula.
(c) Since the impure metal has a smaller work function, there will be more energy left over after the electron escapes and the maximum T is larger for impure Na.
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