### amplitude

(the height of a wave)

The term **amplitude** refers to the height of a wave, e.g.,
for a wave described by the sine function, the distance from
the function's mean value to its peak value, which is the number multiplied by
the sine function. The term is used in descriptions of sound waves,
of the waves carried by electrical circuits and can be used
for electromagnetic radiation though often other measures are used that
carry the same information.

f(t) = m sin t

- t - a continuous variable representing something like
*time* or *the distance along a line*.
- f(t) - function describing the wave.
- m - the amplitude.

**Amplitude** is a commonly-used term within quantum mechanics:
it is literally the a amplitude in **wave mechanics**, one version
of quantum mechanics. This wave-amplitude is the square-root of
the probability of some phenomenon occurring, and in some cited
calculations you see references to *amplitude* as the square root
of the probability even if the association of with waves is not
evident. This amplitude is of high interest because the
quantum-mechanics calculation of a situation's
future probabilities depend not merely on a current probability but
on which of its two possible square roots is the
associated wave's amplitude.

(*waves,measure*)
**Further reading:**

http://en.wikipedia.org/wiki/Amplitude

https://astronomy.swin.edu.au/cosmos/A/Amplitude

**Referenced by pages:**

Faraday rotation

Fourier series

Fourier space

gravitational wave (GW)

gravitational-wave detector

gravitational wave spectrum

gravitational wave strain (h)

Lambda-CDM model (ΛCDM)

Schrödinger equation

signal-to-noise ratio (SNR)

spectral density

visibility

Index