First slide

Photo Electric Effect

Question

The work function of a metal is 4.2 eV, its threshold wavelength will be

Easy

A

4000 $\overset{o}{A}$
B

3500 $\overset{o}{A}$
C

2955 $\overset{o}{A}$
D

2500 $\overset{o}{A}$

Solution

$W_{o} (eV) = \frac{12375}{λ_{o}} \Rightarrow λ_{o} = \frac{12375}{4 .2} \approx 2955 \overset{o}{A}$

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