In alpha decay, which nucleus is emitted?
AHelium
BHydrogen
CHalogen
DHafnium
Answer & Solution
Correct answer: A. Helium
1. The particle has mass number four.
2. It carries two protons and two neutrons.
3. It is a helium nucleus.
_Source: NCERT Class 12 Physics, Ch 13 'Nuclei'_
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