The domains of physics

Physics is divided in to four major domain with respect to size and speed.

Particle size more than a nanometer and in less speed compared to speed of light – classical mechanics.
Particle size less than a nanometer (near to size of atom) and in less speed compared to speed of light – quantum mechanics.
Particle size more than a nanometer and in speed comparable to speed of light – relativistic mechanics.
Particle size less than a nanometer (near to size of atom) and in speed comparable to speed of light – quantum field theory.

Any type of study under physics will come under this four categories.

With respect to energy:

Milli electron volt to few electron volts - solid state physics
Kilo electron volt to million electron volt - nuclear physics
Million electron volt to Giga electron volt - particle physics

With respect to phase:

Solid state - solid state physics
Liquid state – fluid dynamics
Gaseous state – kinematics

To study:

Light – optics
Sound – acoustics
Heat- thermodynamics
More number of particles – statistics
Magnet – magnetism
Current – electrodynamics
Movement – mechanics
Cosmos – cosmology
Space and celestial bodies – astrophysics

In physics we have n number of interdisciplinary fields, but everything fall under the above discussed types.

Example: electronics will fall in solid state physics and electrodynamics

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