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Physics · PYQ NEET UG 2020

हिन्दी

Light of frequency \( 1.5 \) times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

  1. four times
  2. one-fourth
  3. zero
  4. doubled

Correct answer · Option 3

zero

Explanation

New frequency becomes \( 1.5 \nu_0 / 2 = 0.75 \nu_0 \), which is less than the threshold frequency \( \nu_0 \). Thus, photoelectric emission stops completely, making the current zero.
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