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Question

If $M$ is atomic weight , $A$ is mass number then $\frac{M - A}{A}$ represents :
Mass defect
Chain reaction
Packing fraction
Binding energy

A

Binding energy

B

Chain reaction

C

Packing fraction

D

Mass defect

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Solution

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Packing fraction is the mass defect per nucleon i.e. elementary particle in the nucleus. The difference between atomic weight and mass number i.e. mass of elementary particle in the nucleus is known as mass defect. Hence,
$p = \frac{Δ m}{A}$
$p = \frac{M - A}{A}$

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