a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents
a semiconductor crystal of nanometre dimensions with distinctive conductive properties determined by its size
an abrupt transition of an electron, atom, or molecule from one quantum state to another, with the absorption or emission of a quantum
a state of a quantized system which is described by a set of quantum numbers
a theory that attempts to explain gravitational physics in terms of quantum mechanics
a reasonable sum of money to be paid for services rendered or work done when the amount due is not stipulated in a legally enforceable contract
a number which occurs in the theoretical expression for the value of some quantized property of a subatomic particle, atom, or molecule and can only have certain integral or half-integral values
a theory of matter and energy based on the concept of quanta, especially quantum mechanics
a computer which makes use of the quantum states of subatomic particles to store information
the branch of mechanics that deals with the mathematical description of the motion and interaction of subatomic particles, incorporating the concepts of quantization of energy, wave-particle duality, the uncertainty principle, and the correspondence principle
a branch of complementary medicine that uses low-dosage electromagnetic radiation in the treatment, diagnosis, and prevention of disease
a quantum field theory in which the strong interaction is described in terms of an interaction between quarks mediated by gluons, both quarks and gluons being assigned a quantum number called ‘colour’
a quantum field theory that deals with the electromagnetic field and its interaction with electrically charged particles
a field theory that incorporates quantum mechanics and the principles of the theory of relativity