INTERACT WITH THE INVISIBLE
Doppler effect.
Sound in motion.
Motion changes the frequency of sound.
Explore or let your hand take you on a journey.
No app to install. Right in your browser.
Doppler Effect
Laboratory
Move your hand closer. Watch the waves change.
Discover the physics behind your movement.
Echo
Islands
Collect golden stars. Find your rhythm.
Let your hand lead you through three worlds.
First, turn media volume all the way up.The sound is usually inaudible because of its high frequency; there is no need to worry about setting the volume to 100%.Both experiences need a speaker, microphone permission, and a stationary device. Disconnect headphones and Bluetooth.
PHONE + COMPUTERSOUND, MOTION & DISCOVERY
What is the Doppler effect?
The Doppler effect is a change in the observed frequency of a wave when its source or a reflecting object moves relative to the observer. An approaching ambulance sounds higher in pitch; as it moves away, the pitch falls.
Here, your device sends out a high-frequency sound and listens for reflections. Moving your hand changes the reflected frequency. The lab turns that shift into a live view of approaching and receding motion.
Try it in your browser.
You need a speaker, microphone permission and a stationary phone or computer. No camera or app download is required. Microphone audio is processed on your device and is not recorded or uploaded.
Results depend on your hardware and surroundings. These are experiments, not precision measuring instruments. Some people can hear the high-frequency sound; stop if it is uncomfortable.