Assertion :When monochromatic light falls on a photosensitive material, the number of photo electrons emitted per second is $n$ and their maximum kinetic energy is $K_{m a x}$ . If the intensity $I$ of the incident light is doubled, $n$ is doubled but $K_{m a x}$ remains the same. Reason: The value of $n$ is directly proportional to $I$ but $K_{m a x}$ is independent of $I$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
When monochromatic light falls on a photosensitive material, the number of photo electrons emitted per second is n and their maximum kinetic energy is $K_{m a x}$ . If the intensity I of the incident light is doubled, n is doubled but $K_{m a x}$ remains the same. Because the value of n is directly proportional to I but $K_{m a x}$ is independent of I and only depends frequency $(ν)$ of the incident light.

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