Zeeman
Effect
In a magnetic
field, the energy of a particular atomic state depends on value ‘m’, the
magnetic quantum number. A state of total quantum number ‘n’ breaks up into
several sub-states when the atom in the magnetic field and the energies are
slightly more or less than energy of state in the absence of magnetic field.
This phenomenon leads to splitting of individual spectral lines when atoms
radiate in magnetic field. The spacing of lines depends on magnitude of
fields.
Zero
Point Energy
Energy possessed by atoms or molecules even
at absolute zero.
Zeroeth
Law of Thermodynamics
This law was
first enunciated by R H Fowler in 1831. According to this law, when two systems
A and B are in thermodynamic equilibrium with another system C, then A & B
will also be in thermal equilibrium.
Zone
Plate
The optical
device which verifies rectilinear propagation of light approximately by wave
theory.
