# A report onFrequency and Wavelength

Assuming a sinusoidal wave moving at a fixed wave speed, wavelength is inversely proportional to frequency of the wave: waves with higher frequencies have shorter wavelengths, and lower frequencies have longer wavelengths.

- Wavelength

For periodic waves in nondispersive media (that is, media in which the wave speed is independent of frequency), frequency has an inverse relationship to the wavelength, λ (lambda).

- Frequency

## Light

Electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye.

Electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye.

Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).

In physics, electromagnetic radiation (EMR) consists of waves of the electromagnetic (EM) field, propagating through space, carrying electromagnetic radiant energy.

In physics, electromagnetic radiation (EMR) consists of waves of the electromagnetic (EM) field, propagating through space, carrying electromagnetic radiant energy.

The position of an electromagnetic wave within the electromagnetic spectrum can be characterized by either its frequency of oscillation or its wavelength.

## Wave

Propagating dynamic disturbance of one or more quantities.

Propagating dynamic disturbance of one or more quantities.

Waves can be periodic, in which case those quantities oscillate repeatedly about an equilibrium (resting) value at some frequency.

Electromagnetic waves, according to their frequencies (or wavelengths) have more specific designations including radio waves, infrared radiation, terahertz waves, visible light, ultraviolet radiation, X-rays and gamma rays.

## Hertz

The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI) and is defined as one cycle per second.

(For historical reasons, the frequencies of light and higher frequency electromagnetic radiation are more commonly specified in terms of their wavelengths or photon energies: for a more detailed treatment of this and the above frequency ranges, see electromagnetic spectrum.)

## Sound

Vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.

Vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.

Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans.

In air at atmospheric pressure, these represent sound waves with wavelengths of 17 meters to 1.7 cm.

## Wind wave

Water surface wave that occurs on the free surface of bodies of water.

Water surface wave that occurs on the free surface of bodies of water.

Wave length (distance from crest to crest in the direction of propagation)

Wave period (time interval between arrival of consecutive crests at a stationary point)