First slide

Photoelectric effect and study of photoelectric effect

Question

Light of wavelength 1824 Å, incident on the surface of a metal, produces photo-electrons with maximum energy 5.3 eV. When light of wavelength 1216 Å is used, the maximum energy of photoelectrons is 8.7 eV. The work function of the metal surface is (approximately) in eV. (use hc = 12400 eVÅ)

Easy

Solution

$\begin{array}{l} K E_{max} = \frac{h C}{λ} - ϕ \\ 5.3 = \frac{12400}{1824} - ϕ . . . . . . . . . (1) \end{array}$
$8.7 = \frac{12400}{1216} - ϕ . . . . . . . . . (2)$
Solving above equations we get
$ϕ = 1.50 e V$

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