PHYSICAClass 11 Physics simulations · Waves
Doppler effect
Move a sound source and watch its wavefronts crowd together ahead.
What to notice
A stationary observer ahead hears a higher frequency; one behind hears a lower frequency.
Key relation
fahead = f₀c/(c − vs)
Try this
Raise the source speed while keeping its emitted frequency fixed.
What you can change
- Source speed: 0 to 250 m/s
- Wavefront frequency: 2 to 6 Hz
More in Waves
- Beats: two notes, one pulsing sound
- Open and closed organ pipes
- Pulse reflection at a boundary
- Resonance tube: speed of sound
- Ripple tank: two-source interference
- Sonometer: frequency and length
- Standing waves on a string
- Wave speed on a stretched rope
- Superposition of two waves
- Travelling wave
See all Class 11 Physics simulations or every Physica simulation.