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(A) $1$. The photoelectric current $(I)$ is directly proportional to the intensity of incident light,provided the frequency of light is above the thre

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$A$ only

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(A) $1$. The photoelectric current $(I)$ is directly proportional to the intensity of incident light,provided the frequency of light is above the threshold frequency. Therefore,the graph $A$ is correct,showing a linear relationship between photoelectric current and intensity.$2$. The photoelectric current does not depend on the frequency of incident light (as long as it is above the threshold frequency). Once the threshold frequency is reached,the current remains constant with respect to frequency. Therefore,graphs $C$ and $D$ are incorrect.

Which of the following graphs represents the variation of photoelectric current with the property of light shown on the $x-$axis?

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