Threshold wavelength for photoelectric effect on sodium is 5000 A… - Vidyadip

MCQ

Threshold wavelength for photoelectric effect on sodium is $5000 \mathring A$. lts work function is

A
$15 \mathrm{~J}$
B
$16 \times 10^{-14} J$
✓
$4 \times 10^{-19} J$
D
$4 \times 10^{-81} J$

✓

Answer

Correct option: C.

$4 \times 10^{-19} J$

$W_0=\frac{h c}{\lambda_0}=\frac{6.625 \times 10^{-34} \times 3 \times 10^8}{5000 \times 10^{-10}} \mathrm{~J}=4 \times 10^{-19} \mathrm{~J}$

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