If the frequency of incident radiation is increased above threshold frequency, keeping intensity and potential constant then the photoelectric current _____.

Q.1 (iii) If the frequency of incident radiation is increased above threshold frequency, keeping intensity and potential constant then the photoelectric current _____.

A. decreases

B. becomes zero

C. remains same

D. increases

Doubtly Asked 27 Oct 2026 Board exam · March 2026 hsc 12th Save WhatsApp Report

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Answer: C. remains same

Answer: (c) remains same

The photoelectric current depends on the number of photoelectrons emitted per second, which is decided by the intensity of the incident radiation. Increasing the frequency (above the threshold) only increases the maximum kinetic energy of the emitted electrons, not their number. So, at constant intensity and potential, the current remains the same.

Doubtly AI · 27 Oct 2026 AI-verified · Oct 2026 Report

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If the frequency of incident radiation is increased above threshold frequency, keeping intensity and potential constant then the photoelectric current _____.

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