JEE Advanced2007PhysicsNuclear PhysicsActual
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 4 matrix given in the ORS.
Options
- AA-p, r; B-p, q, s; C-p; D-q
- BA-p; B-p, s; C-p; D-q
- CA-p, r; B-p, q; C-p, r; D-q, s
- DA-r, s; B-q; C-p; D-p, q, s
Correct answer
A. A-p, r; B-p, q, s; C-p; D-q
Step-by-step solution
(A) Transition between two atomic energy levels When an electron in an atom transitions from a higher energy level to a lower one, it emits a photon with a specific energy. This is the fundamental principle behind the emission spectra of elements. The hydrogen spectrum is a classic example of this process, where discrete spectral lines are observed due to transitions between specific energy levels. - A matches with r. (B) Electron emission from a material Electron emission from a material can happen in several ways