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 xx 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 )"Hydrogenspectrum"),((D) "Change of photon energy into kinetic energy of electrons",(S)beta-"decay"):}`

Answer

(A) R,P ; (B) Q,S ; (C ) P ; (D) Q