First slide

Photo Electric Effect

Question

In a photoelectric experiment for 4000 A° incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 A, then the potential required to stop the ejection of electron will be:

Moderate

A

2 V
B

Less than 2 V.
C

Zero
D

Greater than 2 V.

Solution

According to Einstein's photoelectric equation
$V_{0} = \frac{h c}{e} [\frac{1}{λ} - \frac{1}{λ_{0}}]$
Hence if $λ$ decreases V₀ increases

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