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QPage 364: Q6: HC Verma: Concepts of Physics - Volume 2 Photoelectric Effect and Wave-Particle Duality Page 364: Q6 Solution: The collector plate in an experiment on photoelectric effect is …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often confuse the effect of an accelerating field on electron speed with the saturation current, incorrectly assuming the current increases. Remember that saturation current is determined solely by the photon flux (intensity), so an external field only alters the kinetic energy of the photoelectrons, not the number of electrons emitted per second.

The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate. A light source is put on and a saturation photocurrent is recorded. An electric field is switched on that has a vertically downward direction.

Multiple Choice Options

  • A The photocurrent will increase.
  • B The kinetic energy of the electrons will increase.
  • C The stopping potential will decrease.
  • D The threshold wavelength will increase.

Step-by-Step Verified Solution

**Answer:** (b) The kinetic energy of the electrons will increase. **Step-by-Step Explanation:** A downward electric field accelerates the electrons towards the collector, increasing their kinetic energy.

All Questions in this Chapter

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