Verified Solution • 2025–26 Session moderate

QPages 441-442: Q4: HC Verma: Concepts of Physics - Volume 2 The Nucleus Pages 441-442: Q4 Solution: Consider a sample of a pure beta-active material.

⚠️ Common Exam Traps & Conceptual Pitfalls

In beta decay the electron is emitted in a three‑body process, so its kinetic energy is not fixed but spans a continuous spectrum up to a maximum value. Assuming a single energy leads to incorrect conclusions about the decay products.

Consider a sample of a pure beta-active material.

Multiple Choice Options

  • A All the beta particles emitted have the same energy.
  • B The beta particles originally exist inside the nucleus and are ejected at the time of beta decay.
  • C The antineutrino emitted in a beta decay has zero mass and hence zero momentum.
  • D The active nucleus changes to one of its isobars after the beta decay.

Step-by-Step Verified Solution

**Answer:** (d) The active nucleus changes to one of its isobars after the beta decay. **Step-by-Step Explanation:** In beta decay, the mass number remains the same, so the daughter nucleus is an isobar of the parent.

All Questions in this Chapter

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