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Doppler is the name given to the falling (or rising) note heard when a tonal signal approaches and then recedes.

Sonar may or may not use Doppler as part of its signal, but essentially a Sonar system emits a sharp chirp of signal and times its return period as an indication of the distance.

Cleverly enough, some moths have evolved so that when they detect a (bats) sonar ping, their flight muscles turn them away from the sonar chirp. This is a reflex, not a trained reaction.

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Q: What is the difference between Doppler and Sonar?
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