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  4. A photocell is receiving light from a source placed at a distance of 1 m . If the same source is to be placed at a distance of 2 m , then the ejected electrons

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Q. A photocell is receiving light from a source placed at a distance of $1 \, m$ . If the same source is to be placed at a distance of $2 \, m$ , then the ejected electrons

NTA AbhyasNTA Abhyas 2020

Solution:

$\text{Number of ejected electrons} \propto \left(\text{Intensity}\right) \propto \frac{1}{\left(\text{Distance}\right)^{2}}$
Therefore an increment of distance two times will reduce the number of ejected electrons to $1/4^{th}$ of the previous one.