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NEET 2025, Physics Q38: Introduction and Photoelectric Effect

NEET2025Physics
Q.

Which of the following options represent the variation of photoelectric current with property of light shown on the x-axis?

  1. A

    A only

  2. B

    A and C

  3. C

    A and D

  4. D

    B and D

Solution

Photoelectric current is directly proportional to the intensity of incident light (more photons → more photo-electrons per second). Graph A shows this linear relationship correctly.

Photoelectric current does NOT depend linearly on frequency. Frequency determines the maximum kinetic energy of photoelectrons (and the threshold for emission), not the current. So graphs C and D are wrong.

Only A is correct.

Concept behind this question

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