| (a) K electron capture |
(p) excess protons |
| (b) positron emission |
(q) x-rays |
| (c) crystallography |
(r) \(\gamma\)-rays |
| (d) electron-positron annihilation |
(s) photons |
Submission Closed
The following explanation is the edited version of Ankul Garg's submission.
a) K electron capture is a decay mode for those isotopes which have too many protons in their nuclei. It happens by the capture of a K-shell electron in the nucleus leading to formation of a positron and neutrino. Also, after K electron capture, the atom in its excited state emits X-rays due to electron transition from outer shell to inner shell. X-rays are made of photons. Thus, a) matches with p), q) & s).
b) Positron emission is also another mode of decay in isotopes having too many protons in their nuclei. It is Beta plus decay in which a proton gets converted into neutron, positron and a neutrino.
So b) matches with p).
c) In crystallography, X-rays are used to analyse the diffraction pattern of the crystal. X-rays are made of photons. So c) matches with q) & s).
d) Electron-Positron annihilation occurs when an electron collides with a positron to create gamma rays photons. In fact, the conservation of linear momentum and total energy in the process forbids the emission of a single gamma ray but leads to emission of a large no. of gamma ray photons.
So d) matches with r) and s).
Hence correct match is: pqs,p,qs,rs.