Verified Solution • 2025–26 Session moderate

QPages 441-442: Q9: HC Verma: Concepts of Physics - Volume 2 The Nucleus Pages 441-442: Q9 Solution: Two lithium nuclei in a lithium vapour at room temperature do…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often ignore that the kinetic energy of atoms at room temperature (~0.025 eV) is many orders of magnitude smaller than the Coulomb barrier (~MeV) between two $^7$Li nuclei, so the reaction cannot occur despite any binding‑energy considerations.

Two lithium nuclei in a lithium vapour at room temperature do not combine to form a carbon nucleus because

Multiple Choice Options

  • A a lithium nucleus is more tightly bound than a carbon nucleus
  • B carbon nucleus is an unstable particle
  • C it is not energetically favourable
  • D Coulomb repulsion does not allow the nuclei to come very close

Step-by-Step Verified Solution

**Answer:** (d) Coulomb repulsion does not allow the nuclei to come very close. **Step-by-Step Explanation:** At room temperature, the Coulomb repulsion between lithium nuclei prevents them from getting close enough for the nuclear force to act.

All Questions in this Chapter

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