The half-life period of radium is $1600 $ years. Its average life time will be.......years
$3200$
$4800$
$2319$
$4217$
(c) Average life $\frac{1}{\lambda } = \frac{{1600}}{{0.693}} = 2308 \approx 2319$ years.
A heavy nucleus $Q$ of half-life $20$ minutes undergoes alpha-decay with probability of $60 \%$ and beta-decay with probability of $40 \%$. Initially, the number of Q nuclei is $1000$ . The number of alphadecays of $Q$ in the first one hour is
The decay constant of a radioactive element is $0.01$ per second. Its half life period is …….$sec$
In a radioactive decay chain reaction, ${ }_{90}^{230} Th$ nucleus decays into ${ }_{84}^{214} Po$ nucleus. The ratio of the number of $\alpha$ to number of $\beta^{-}$particles emitted in this process is. . . . .
The rate of disintegration of fixed quantity of a radioactive element can be increased by
Write down the definition and formula of half life of radioactive substance.
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