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When a gamma photon changes into a particle and an antiparticle.
Unit of pressure or stress equal to 1 Nm^-2.
The difference in distances from two coherent sources to an interference fringe.
Period of a wave
Time for one complete cycle of a wave to pass a point.
THe fraction of a cycle between the vibrations of two vibrating particles, measured in radians or degrees.
Emission of electrons from a metal surface when the surface is illuminated by light of frequency greater than a minimum value known as the threshold frequency.
Packet or 'quantum' of electromagnetic waves.
A meson that consists of an up or down quark and an up or down antiquark.
Travsverse waves that cibrate in one plane only.
Deformation of a solid beyond its elastic limit.
Positive temperature coefficient
The resistance of a metal increases when its temperature is increased.
Antiparticle of the electron.
Work done or energy transfer per unit charge between two points when chrge moves from one point to the other.
Two or more resistors in series connected to a source of pd.
The energy of an object due to its position.