First slide

Photo Electric Effect

Question

If the threshold wavelength for sodium is 5420 $\overset{o}{A}$ , then the work function of sodium is

Easy

A

4.58 eV
B

2.28 eV
C

1.14 eV
D

0.23 eV

Solution

$W_{o} = \frac{12375}{λ_{o}} = \frac{12375}{5420} = 2 .28 eV$

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