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MHT CET20227 Aug 2022Morning ShiftPhysicsDual Nature of MatterActual

When a certain metal surface is illuminated with light of frequency v , the stopping potential for the photoelectric current is V_s . When the same surface is illuminated by a light of frequency v 2 , the stopping potential is V_s / 4 . The threshold frequency of photoelectric emission is

Options

  1. A4 v 3
  2. B5 v 3
  3. Cv 3
  4. Dv 5

Correct answer

C. v 3

Step-by-step solution

Stopping potential is the energy required to stop the moving electrons after photoelectric emission. Hence it must be equal to the maximum kinetic energy of the emitted electron. Incident energy = Threshold energy + Kinetic energy Given: Multiply equation (2) by 4 and substract equation (1) from it to obtain: v₀= v 3

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