First slide

Photo Electric Effect

Question

Threshold wavelength for photoelectric effect on sodium is 5000 A. Its work function is

Very Easy

A

15 J
B

$16 \times 10^{- 14} J$
C

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

$4 \times 10^{- 81} J$

Solution

$W_{o} = \frac{hc}{λ_{o}} = \frac{6 .625 \times 10^{- 34} \times 3 \times 10^{8}}{5000 \times 10^{- 10}} J = 4 \times 10^{- 19} J$

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