(C) Radioactive decay is a first-order nuclear process. The decay constant $(\lambda)$ is a characteristic property of the radioactive nucleus and is

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Decay constant increases with an increase in temperature.

(C) Radioactive decay is a first-order nuclear process. The decay constant $(\lambda)$ is a characteristic property of the radioactive nucleus and is independent of external physical conditions such as temperature,pressure,or chemical environment. Therefore,the statement that the decay constant increases with an increase in temperature is false.

Class 12 Chemistry Nuclear Chemistry Radioactivity and a,b and g rays

Medium

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

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A
Amount of radioactive substance remaining after three half-lives is $1/8$th of the original amount.
B
Decay constant does not depend upon temperature.
C
Decay constant increases with an increase in temperature.
D
Half-life is $\ln 2$ times of $1/\lambda$ (where $\lambda$ is the decay constant).