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(A) In the photoelectric effect,the number of photoelectrons emitted per second is directly proportional to the intensity of the incident light.Intens

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one-fourth of the initial number.

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(A) In the photoelectric effect,the number of photoelectrons emitted per second is directly proportional to the intensity of the incident light.Intensity $(I)$ of light from a point source follows the inverse square law,$I \propto \frac{1}{r^2}$,where $r$ is the distance from the source.When the distance is increased from $r_1 = 1 \ m$ to $r_2 = 2 \ m$,the intensity becomes $I_2 = I_1 	imes (\frac{r_1}{r_2})^2 = I_1 	imes (\frac{1}{2})^2 = \frac{I_1}{4}$.Since the number of emitted photoelectrons is proportional to the intensity,the number of emitted electrons will become one-fourth of the initial number.

$A$ photocell is illuminated by a small lamp placed at a distance of $1 \ m$. If the lamp is shifted to a distance of $2 \ m$,then the number of emitted electrons will be:

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