First slide

Radio activity

Question

The mass of an $α$ -particle is

Easy

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 neutrons

Solution

This is due to mass defect because a part of mass is used in keeping the neutrons and protons bound as $α$ -particle.

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