Verified Solution • 2025–26 Session moderate

QPages 440-441: Q1: HC Verma: Concepts of Physics - Volume 2 The Nucleus Pages 440-441: Q1 Solution: The mass of a neutral carbon atom in ground state is

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often confuse the specific definition of the atomic mass unit (where $^{12}\text{C}$ is exactly 12 u) with the general term 'carbon atom,' which usually implies the natural isotopic mixture. Since natural carbon contains lighter isotopes like $^{13}\text{C}$ and $^{14}\text{C}$, the average mass of a neutral carbon atom is actually less than 12 u, making the provided solution's logic for option C scientifically inconsistent with standard physics definitions.

The mass of a neutral carbon atom in ground state is

Multiple Choice Options

  • A exact 12 u
  • B less than 12 u
  • C more than 12 u
  • D depends on the form of carbon such as graphite or charcoal.

Step-by-Step Verified Solution

**Answer:** (c) more than 12 u. **Step-by-Step Explanation:** The mass of a neutral carbon-12 atom is exactly 12 u by definition. Wait�the mass of a neutral carbon-12 atom is exactly 12 u. Standard answer: exactly 12 u.

All Questions in this Chapter

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