# A source of light is placed at a distance of 50 cm from a photocell and the stopping potential is found to be $V_{0}$. If the distance between the light source and photocell is made 25 cm, the new stopping potential will be Option 1) $2V_{0}$ Option 2) $\frac{V_{0}}{2}$ Option 3) $V_{0}$ Option 4) $4V_{0}$

As we discussed in concept

Stopping Potential /Cut-off Potential -

It is defined as the potential necessary to stop any electron from reaching the other side.

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Stopping potential depends on frequency of light and not on intensity since frequency of light remains constant, stopping potential will remain same.

Option 1)

$2V_{0}$

This option is incorrect.

Option 2)

$\frac{V_{0}}{2}$

This option is incorrect.

Option 3)

$V_{0}$

This option is correct.

Option 4)

$4V_{0}$

This option is incorrect.

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