About this Simulation

This interactive applet models the Doppler effect, demonstrating how sound waves change frequency and wavelength when the source moves relative to an observer. Learners can adjust the source velocity and observe real-time changes to wave properties, exploring how motion affects perceived sound pitch and wave compression.

Learning objectives: Understand how relative motion between a sound source and observer affects observed frequency | Visualize wave compression and expansion caused by source velocity | Explain the relationship between source speed, wavelength, and pitch perception