Which of the following statement is not true for radioactive decay?

Which of the following statement is not true for radioactive decay?
  1. Decay constant increases with increase in temperature.
  2. Amount of radioactive substance remained after three half lives is $\frac{1}{8}$ th of original amount.
  3. Decay constant does not depend upon temperature.
  4. Half life is $\ln 2$ times of $\frac{1}{\text { rate constant }}$.

Solution

For radioactive decay, decay constant does not depend upon temperature because for radioactive decay activation energy is zero.

Asked in: JEE Main 2025 (22 Jan Shift 1)

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