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QPage 364: Q4: HC Verma: Concepts of Physics - Volume 2 Photoelectric Effect and Wave-Particle Duality Page 364: Q4 Solution: If the wavelength of light in an experiment on photoelectric…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume that doubling the wavelength automatically stops photoemission because the photon energy halves. In reality, emission occurs only if $E_{gamma}=hc/lambda$ remains above the metal’s work function $phi$; if it still exceeds $phi$, electrons are emitted and the stopping potential $V_s=(E_{gamma}-phi)/e$ simply decreases. Always compare $E_{gamma}$ to $phi$ before deciding whether emission will happen.

If the wavelength of light in an experiment on photoelectric effect is doubled,

Multiple Choice Options

  • A photoelectric emission will not take place
  • B photoelectric emission may or may not take place
  • C the stopping potential will increase
  • D the stopping potential will decrease

Step-by-Step Verified Solution

**Answer:** (b), (d). **Step-by-Step Explanation:** If wavelength is doubled, photoelectric emission may or may not take place (b). If it does, stopping potential decreases (d).

All Questions in this Chapter

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