First slide

Photoelectric effect and study of photoelectric effect

Question

If a surface has work function of 3.00 eV, the longest wavelength of light which will cause the emission of electrons is

Easy

A

$4.8 \times 10^{- 7} m$
B

$5.99 \times 10^{- 7} m$
C

$4.13 \times 10^{- 7} m$
D

$6.84 \times 10^{- 7} m$

Solution

$\begin{array}{l} \frac{h c}{λ_{max}} = 3 \times 1.6 \times 10^{- 19} J \\ \Rightarrow λ_{max} = \frac{6.6 \times 10^{- 34} \times 3 \times 10^{8}}{3 \times 1.6 \times 10^{- 19}} = 4.125 \times 10^{- 7} m \end{array}$

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