First slide

Photo Electric Effect

Question

In a photo electric cell, the wavelength of incident light is changed from $4000 \overset{o}{A} t o 3600 \overset{o}{A} .$ Then the change in stopping potential will be

Moderate

A

0.25 volt
B

0.35 volt
C

0.15 volt
D

0.10. volt

Solution

(2)
$\begin{array}{l} \frac{h c}{λ} = ϕ + e v_{0} \\ ∴ \frac{h c}{λ} - \frac{h c}{λ_{i}} = e [{(V_{0})}_{f} - {(V_{0})}_{i}] \\ {(V_{0})}_{f} - {(V_{0})}_{i} = Δ V = \frac{1}{e} . [\frac{h c}{λ_{f}} - \frac{h c}{λ_{i}}] \\ = (\frac{12400}{3600} - \frac{12400}{4000}) v o l t ≃ 0.35 v o l t \end{array}$

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