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| Absolute zero |
The lowest theoretical temperature a material can have, where the molecules that make up the material hae no kinetic energy. Absollute zero is reached at 0K or -273C |
| Acceleration |
A vector quantity defined as the rate of change of the velocity vector with time |
| Activity |
In radioactive substances, the number of nuclei that decay per second. Activity, A, will be larger in large samples of radioactive material, since there will be more nuclei. |
| Alpha Decay |
A form of radioactive decay where a heavy element emits an alpha particle and some energy, thus transforming into a lighter, more stable, element. |
| Alpha Particle |
A particle, a, which constits of two protons and two neutrons. It is identical to the nucleus of a helium atom and is ejected by heavy particles undergoing alpha decay |
| Amplitude |
Measures the amount of energy a system has |
| Angle of incidence |
When a light ray strikes a surface, the angle of incidence is the angle between the incident ray and the normal. |
| Angle of reflection |
the angle between a reflected ray and the normal |
| Angle of refraction |
the angle between and refracted ray and the line normal to the surface |
| Angular acceleration |
A vector quantity, a, equal to the rate of change of the angular velocity vector with time. It is tipically given in units of rad/s squared |
| Angular displacement |
The net change, (-), in a poin't angular position, (/). It is a scalar quantity |
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