The rate of disintegration of fixed quantity of a radioactive element can be increased by
The rate of disintegration of fixed quantity of a radioactive element can be increased by
- A
Increasing the temperature
- B
Increasing the pressure
- C
Chemical reaction
- D
It is not possible
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Activities of three radioactive substances $A , B$ and $C$ are represented by the curves $A, B$ and $C,$ in the figure. Then their half-lives $T _{\frac{1}{2}}( A ): T _{\frac{1}{2}}( B ): T _{\frac{1}{2}}( C )$ are in the ratio
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A parent nucleus $X$ is decaying into daughter nucleus $Y$ which in turn decays to $Z$. The half lives of $X$ and $Y$ are $40000 \,yr$ and $20 \,yr$, respectively. In a certain sample, it is found that the number of $Y$ nuclei hardly changes with time. If the number of $X$ nuclei in the sample is $4 \times 10^{20}$, the number of $Y$ nuclei present in it is
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Starting with a sample of pure ${}^{66}Cu$, $7/8$ of it decays into $Zn$ in $15\ minutes$ . The it decays into $Zn$ in $15\ minutes$ . The corresponding half-life is ................ $minutes$
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