The unit of radioactivity is Rutherford. Its value is:
- A$3.7 \times 10^{10} \text{ disintegrations/sec}$
- B$3.7 \times 10^{6} \text{ disintegrations/sec}$
- C$1.0 \times 10^{10} \text{ disintegrations/sec}$
- D$1.0 \times 10^{6} \text{ disintegrations/sec}$
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At $t = 0$,the counting rate from a radioactive source is $1600 \text{ counts/s}$,and at $t = 8 \text{ s}$,it is $100 \text{ counts/s}$. The counting rate at $t = 6 \text{ s}$ will be:
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View SolutionThe half-life of radioactive $Po$ (Polonium) is $138.6 \, \text{days}$. For $1,000,000$ Polonium atoms, the number of disintegrations in $24 \, \text{hours}$ is:
Medium
View SolutionThe half-life of a radioactive substance is $20 \, min$. The approximate time interval $(t_2 - t_1)$ between the time $t_2$ when $\frac{2}{3}$ of it has decayed and the time $t_1$ when $\frac{1}{3}$ of it has decayed is .......... $min$.
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View SolutionTwo radioactive substances $A$ and $B$ have decay constants $5 \lambda$ and $\lambda$ respectively. At $t=0$,they have the same number of nuclei. The ratio of the number of nuclei of $A$ to those of $B$ will be $(1/e)^2$ after a time interval of:
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