# NEET Physics Nuclei Questions Solved

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The mass of an $\mathrm{\alpha }$-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

(a) This is due to mass defect because a part of mass is used in keeping the neutrons and protons bound as $\mathrm{\alpha }$-particle.

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