CBSE 2024, Set 1

Question

Assertion (A): In photoelectric effect, the kinetic energy of the emitted photoelectrons increases with increase in the intensity of the incident light.
Reason (R): Photoelectric current depends on the wavelength of the incident light.

Select the correct option: A). Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). B). Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). C). Assertion (A) is true, but Reason (R) is false. D). Assertion (A) is false and Reason (R) is also false.

Edvaya · Accepted Answer

The correct answer is Assertion (A) is false and Reason (R) is also false.. **SOLUTION** **Assertion (A) is False:** In the photoelectric effect, the maximum kinetic energy of the emitted photoelectrons depends exclusively on the frequency (or wavelength) of the incident light and the nature of the material. It does **not** depend on the intensity of the incident light. (Increasing intensity only increases the number of photoelectrons emitted). **Reason (R) is False:** Photoelectric current primarily depends on the **intensity** of the incident light (provided the frequency is above the threshold), not on its wavelength. Therefore, both the Assertion and the Reason are completely false.

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Physics > Modern Physics > Dual Nature Of Radiation And Matter

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