Q168 / 180 · KCET 2010 · Physics

Pick out the correct statement from the following.

  • A
    Energy released per unit mass of the reactant is less in case of fusion reaction
  • Correct answer
    B
    Packing fraction may be positive or may be negative
  • C
    $\mathrm{Pu}^{239}$ is not suitable for a fission reaction
  • D
    For stable nucleus, the specific binding energy is low

Solution

Mass defect per nucleon is called packing fraction. Packing fraction $(f)=\frac{\Delta \mathrm{m}}{\mathrm{A}}=\frac{\mathrm{m}-\mathrm{A}}{\mathrm{A}}$, where $\mathrm{m}=$ mass of nucleus, $\mathrm{A}=$ mass number. Packing fraction measures the stability of a nucleus. Smaller the value of packing fraction, larger is the stability of nucleus. Packing fraction may be positive, negative or zero.

Hence, the correct answer is option: 'B'.

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