Q136 / 160 · AP EAMCET 2020 (17 Sep Shift 2) · Physics

A radioactive sample has an activity \(A\) in air. If the sample is kept inside water, then its activity \(A^{\prime}\)

  • A
    becomes less than \(A\)
  • B
    becomes more than \(A\)
  • Correct answer
    C
    is same as \(A\)
  • D
    will be less than or equal to \(A\) depending on the density of water

Solution

Activity of a radioactive sample does not depend on the type of medium in which it is kept. Hence, if the radioactive sample is kept inside water, then its activity \(\left(A^{\prime}\right)\) remains same as in air. i.e., \(A^{\prime}=A\)

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

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