How a unique but simple experiment in the 19th century gave a new insight into the behaviour of sound waves.
- The Doppler Effect is when the pitch of a sound seems to change as it moves past.
- The scientist Christian Doppler, 1842, was the first to explain why.
- An experiment was done using a steam train, horn players and observers.
- The effect was found to be true of all waves including light.
When a sound travels out from a moving source, a stationary observer can hear a clear effect.
The pitch becomes higher as it approaches.
And then lowers as it moves away.
This effect is called doppler shift.
Christian Doppler, 1842
The phenomenon is named after Christian Doppler, the scientist who first explained why the ...
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