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  4. Light of wavelength 4000 mathringA is incident on a sodium surface for which the threshold wavelength of photoelectrons is 5420 mathringA. The work function of sodium is:

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Q. Light of wavelength $4000\,\mathring{A}$ is incident on a sodium surface for which the threshold wavelength of photoelectrons is $5420 \,\mathring{A}$. The work function of sodium is:

Dual Nature of Radiation and Matter

Solution:

$\phi=\frac{ hc }{\lambda_{0}}$
$=\frac{12400}{5420} eV =2.28 eV$