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QPage 364: Q1: HC Verma: Concepts of Physics - Volume 2 Photoelectric Effect and Wave-Particle Duality Page 364: Q1 Solution: When the intensity of a light source in increased,

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often incorrectly assume that increasing light intensity increases the energy of individual photons, but intensity only increases the photon flux (number of photons per second) while the energy of each photon ($E = hf$) remains constant.

When the intensity of a light source in increased,

Multiple Choice Options

  • A the number of photons emitted by the source in unit time increases
  • B the total energy of the photons emitted per unit time increases
  • C more energetic photons are emitted
  • D faster photons are emitted

Step-by-Step Verified Solution

**Answer:** (a), (b). **Step-by-Step Explanation:** Increasing intensity increases the number of photons (a) and the total energy emitted per unit time (b).

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