In a photoelectric experiment for 4000 A incident radiation, the … - Vidyadip

MCQ

In a photoelectric experiment for $4000 \mathcal{A}$ incident radiation, the potential difference to stop the ejection is $2 \mathrm{~V}$. If the incident light is changed to $3000 A$, then the potential required to stop the ejection of electrons will be

A
$2 \mathrm{~V}$
B
Less than $2 \mathrm{~V}$
C
Zero
✓
Greater than $2 \mathrm{~V}$

✓

Answer

Correct option: D.

Greater than $2 \mathrm{~V}$

According to Einstein's photoelectric equation
$E=W_0+K_{\max } \Rightarrow V_0=\frac{h c}{e}\left[\frac{1}{\lambda}-\frac{1}{\lambda_0}\right]$
Hence if $\lambda$ decreases $V_0$ increases.

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