Embibe Experts Solutions for Exercise 3: Assignment

The count rate of a radioactive source at $t=0$ was $1600 \mathrm{count} {\mathrm{s}}^{–1}$ and at $t=8 \mathrm{s},$ it was $100 \mathrm{count} {\mathrm{s}}^{–1}$ The count rate (in counts) at $t=6 \mathrm{s}$ was

${}^{40}\mathrm{K}$ isotope of potassium has a half life of $1.37\times {10}^9$ years and decays to an isotope of argon which is stable. In a particular sample of moon rock, the ratio of potassium atoms to argon atoms was found to be $1 : 7.$ The age of the rock, assuming that originally there was no argon present, is

Out of the following, which one is not emitted by a natural radioactive substance?

In the equation
${}_{13}{}^{27}\mathrm{Al}+{}_2{}^4\mathrm{He}⟶{}_{15}{}^{30}\mathrm{P}+\mathrm{X},$
The correct symbol for $\mathrm{X}$ is

In nuclear reactions we have the conservation of

$\mathrm{\gamma }$-decay occurs when

The binding energy per nucleon for ${{}_1\mathrm{H}}^1, {{}_1\mathrm{H}}^3$ and ${{}_2\mathrm{He}}^4$ are $a, b$ and $c$ respectively. Then energy released in a hypothetical nuclear reaction ${{}_1\mathrm{H}}^1+{{}_1\mathrm{H}}^3\to {{}_2\mathrm{He}}^4+$ energy is

If the mass of a radioactive sample is increased then, the activity and decay constant of the sample constant will