The mass of α -particle is (a) less than the sum of masses of two protons and two neutrons (b) equal to mass of four protons (c) equal to mass of four neutrons (d) equal to sum of masses of two protons and two neutrons

Answer: (a). An α -particle is a bound He nucleus of 2 protons and 2 neutrons. Binding energy 28.3 MeV corresponds to a mass defect, so mα < 2mp + 2mn. So the answer is (a).

The mass of α -particle is | NEET 1992 (AIPMT)

Q33NEET 1992 · AIPMTEasy

Mass Defect & Binding Energy

The mass of $\alpha$ -particle is

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Answer: (a)

An $\alpha$ -particle is a bound He nucleus of 2 protons and 2 neutrons.
Binding energy $28.3$ MeV corresponds to a mass defect, so $m_\alpha < 2m_p + 2m_n$ .
So the answer is (a).

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