CBSE 2024, Set 2

Question

Assertion (A): Photoelectric current increases with an increase in intensity of incident radiation, for a given frequency of incident radiation and the accelerating potential.
Reason (R): Increase in the intensity of incident radiation results in an increase in the number of photoelectrons emitted per second and hence an increase in the photocurrent.

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 Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).. **SOLUTION** **Assertion (A) is True:** In the photoelectric effect, the saturation photocurrent is directly proportional to the intensity of the incident light (provided the frequency is above the threshold). **Reason (R) is True:** Physically, "increasing intensity" means increasing the number of incident photons striking the surface per second. Since one photon ejects one electron, more photons result in more photoelectrons emitted per second, which directly constitutes a higher photocurrent. Thus, Reason (R) provides the perfect fundamental explanation for Assertion (A).

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Physics > Modern Physics > Dual Nature Of Radiation And Matter

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