In the nuclear decay given below
$_z{X^A}{ \to _{z + 1}}{Y^A}{ \to _{z - 1}}{K^{A - 4}}{ \to _{z - 1}}{K^{A - 4}}$
the particles emitted in the sequence are
$\alpha,\;\beta,\;\gamma $
$\beta ,\;\alpha ,\;\gamma $
$\gamma ,\;\alpha ,\;\beta $
$\beta ,\;\gamma ,\;\alpha $
Some laws/processes are given in Column $I$. Match these with the physical phenomena given in Column $II$ and indicate your answer by darkening appropriate bubbles in the $4 \times 4$ matrix given in the $ORS$.
Column $I$ | Column $II$ |
$(A)$ Transition between two atomic energy levels | $(p)$ Characteristic $X$-rays |
$(B)$ Electron emission from a material | $(q)$ Photoelectric effect |
$(C)$ Mosley's law | $(r)$ Hydrogen spectrum |
$(D)$ Change of photon energy into kinetic energy of electrons | $(s)$ $\beta$-decay |
If a heavy nucleus has $N / Z$ ratio higher than that required for stability, then
During negative $\beta$-decay
The $\alpha$-particle is the nucleus of an atom of
${ }_{92} U^{235}$ nucleus absorbs a neutron and disintegrates into ${ }_{54} X e^{139} ,{ }_{38} Sr ^{94}$ and $X$. What will be the product $X$ ?