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  4. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of 5000 mathringA Its work function is

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Q. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of $5000\,\mathring{A}$ Its work function is

AIPMTAIPMT 1988Dual Nature of Radiation and Matter

Solution:

$W_0 = \frac{hc}{\lambda_0}=\frac{6.63 \times 10 ^{-34} \times 3 \times 10^8 }{5000 \times10^{-10}}=4 \times 10^{-19}\, J$