# Plane wave ( in the positive x direction)

## Description

In the physics of wave propagation, a plane wave is a constant-frequency wave whose wavefronts (surfaces of constant phase) are infinite parallel planes of constant peak-to-peak amplitude normal to the phase velocity vector. A plane wave travelling in the positive x direction is representing by a cosine function.

Related formulas## Variables

A_{x} | The disturbance of the wave at the given point (dimensionless) |

A_{0} | the amplitude of the wave (the peak magnitude of the oscillation) (dimensionless) |

k | The wave’s wave number (radians/m) |

x | The point along the x-axis. (m) |

ω | The wave’s angular frequency (radians/sec) |

t | The given point in time (sec) |

ϕ | The phase shift of the wave (radians) |