Atomic and Nuclear Physics - 2 Marks

Faraday Dark Space:

Faraday dark space is the dark region between the negative glow and the positive column in a  vacuum tube when the pressure is low as 1 mm of Hg.

Spectral Line Width:

Real spectral lines are not sharp due to various factors and broadened. Spectral line width is defined as Full Width at Half Maximum( FWHM)  of the spectral peak and measured in either Hz or nm.

Crystallography :

Crystallography is a branch of experimental science that deals with finding the arrangement and bonding of atoms in crystalline solids and with the geometric structure of crystal lattices.


Transient Equilibrium:

Transient equilibrium between a radioactive parent-daughter isotope nuclei pair is reached when the daughter  nucleus has a shorter half life than the parent nucleus but not negligible.

Quarks:

A quark is a type of elementary particle which is a fundamental constituent of matter. Quark combine to form hadrons for example protons and neutrons. Quark comes in six different types.