Doppler effect
The Doppler Effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. It occurs for any type of wave, but it is commonly observed with sound waves.
Source approaching: Waves compressed, higher perceived frequency (e.g., ambulance siren).
Source moving away: Waves stretched, lower perceived frequency (e.g., ambulance siren moving away). • Applies to all waves:
Sound waves (common experience).
Light waves (astronomical study of stars and galaxies).
Introduction to Waves – Definition, Types, Properties
A wave is a propagating dynamic disturbance (change from equilibrium) of one or more quantities in physics, mathematics, and related subjects, commonly described by a wave equation.
At least two field quantities in the wave medium are involved in physical waves. Periodic waves occur when variables oscillate periodically around an equilibrium (resting) value at a specific frequency.
A traveling wave occurs when the entire waveform moves in one direction; a standing wave occurs when two superimposed periodic waves move in opposite directions. The amplitude of vibration in a standing wave features nulls at some points when the wave amplitude seems reduced or even zero.
Table of Content
- Wave
- Characteristics of Waves
- Types of Waves
- Formula for Speed of Wave
- Properties of Waves
- Sample Problems