# Doppler Effect Wavelength Front

## Description

Doppler Effect is the change in frequency and wavelength of a wave for an observer moving relative to the source of the waves. Compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recession. if the source of waves is moving away from the observer, each wave is emitted from a position farther from the observer than the previous wave, so the arrival time between successive waves is increased, reducing the frequency. The distance between successive wave fronts is then increased, so the waves “spread out”. Wavelength in Front of a Moving Source can be calculated by the Source Velocity and the Source Frequency.

Related formulas## Variables

λ | Wavelength in Front of a Moving Source (m) |

v | Wave Velocity (m/s) |

u | Source Velocity (m/s) |

f0 | Source Frequency (Hz) |