Q90 / 180 · AIIMS 2014 · Physics

Assertion: The ratio for time taken for light emission from an atom to that for release of nuclear energy in fission is $1: 100$. Reason: Time taken for the light emission from an atom is of the order of $10^{-8} \mathrm{~s}$.

  • Correct answer
    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

Time taken for the light emission from an atom $\approx 10^{-8} \mathrm{~s}$. Time taken for release of energy in fission $\approx 10^{-6}$ Required ratio $=\frac{10^{-8}}{10^{-6}}=\frac{1}{100}=1: 100$

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

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