Level 3

In the given reaction

${}_Z{X}^A{\stackrel{}{\to }}_{Z-2}{Y}^{A-4}{\stackrel{}{\to }}_{Z-1}{K}^{A-4}{\stackrel{}{\to }}_{Z-1}{K}^{A-4}$

Radioactive radiations are emitted in the sequence

Which among the following statements is not true?

For a certain radioactive process, the graph between $\ln R$ and $t\left(\sec \right)$ is obtained as shown in the figure. Then the value of half life for the unknown radioactive material is approximately:

There are ${10}^{10}$ radioactive nuclei in a given radioactive element. Its half-life time is $1 \min$. How many nuclei will remain after $30 \mathrm{s}$?$(\sqrt{2}=1.414)$

When neutrons are bombarded on ${\mathrm{B}}^{10}$, then ${{}_0\mathrm{n}}^1⟶\mathrm{X}+{{}_2\mathrm{He}}^4$, $X$ is:

$200 \mathrm{MeV}$ energy is obtained by fission of $1$ nuclei of ${{}_{92}\mathrm{U}}^{235}$, to obtain $1 \mathrm{kW}$ energy number of fission per second will be

The most suitable element for nuclear fission is the element with atomic number near

In the nuclear reaction ${}_6{C}^{11}\to { }_9{B}^{11}+{\beta }^{+}+X^{-}$, what does $X$ stand for?