Question

Calculate the threshold frequency of metal if the binding energy is 180.69 KJ/mole.

Answer 1

Binding energy $=180.69kg/mol.$

It is define as energy required to remove an electron from metal surface per mole.

Energy required for one atom $=\frac{180.69\times {10}^3}{6.022\times {10}^{23}}$

$=3\times {10}^{-21}$

$no=3\times {10}^{-21}$

$U=\frac{3\times {10}^{-21}}{6.626\times {10}^{-39}}$

$=4.527\times {10}^{12}$

$=4.527\times {10}^{12}Hz$