Verified Solution • 2025–26 Session moderate

QPages 440-441: Q13: HC Verma: Concepts of Physics - Volume 2 The Nucleus Pages 440-441: Q13 Solution: During a negative beta decay,

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often mistakenly believe that the emitted beta particle is an electron already residing within the nucleus, but in reality, it is created at the moment of decay when a neutron converts into a proton.

During a negative beta decay,

Multiple Choice Options

  • A an atomic electron is ejected
  • B an electron which is already present within the nucleus is ejected
  • C a neutron in the nucleus decays emitting an electron
  • D a proton in the nucleus decays emitting an electron.

Step-by-Step Verified Solution

**Answer:** (c) a neutron in the nucleus decays emitting an electron. **Step-by-Step Explanation:** In beta-minus decay, a neutron converts into a proton, emitting an electron and an antineutrino.

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