$\beta$-decay means emission of electron from
Show Hint
- innermost electron orbit
- a stable nucleus
- outermost electron orbit
- radioactive nucleus
The Correct Option is D
Solution and Explanation
$\beta$-decay is a nuclear phenomenon, not an atomic one involving electron orbits.
Step 2: Mechanism
It occurs when a neutron in an unstable (radioactive) nucleus transforms into a proton, emitting an electron (beta particle) and an antineutrino.
Step 3: Conclusion
The electron originates from the radioactive nucleus itself.
Final Answer: (d)
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