MCQ
If $M$ is atomic weight, A is mass number then $\frac{\text{M - A}}{\text{A}}$ represents:
- AMass defect
- ✓Packing fraction
- CBinding energy
- DChain reaction
✓
Answer
Correct option: B.
Packing fraction
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,
$\text{p}=\frac{\Delta\text{m}}{\text{A}}$
$\text{p}=\frac{\text{M - A}}{\text{A}}$
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