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The Doppler Effect

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Frequency gets higher as a sound moves closer.
Frequency gets lower as a sound moves away.
The Doppler Effect www.youtube.com
Does the frequency get higher, or lower as the ambulance moves away from the person on the left?
The frequency gets lower as the ambulance moves away from the person on the left.
Does the frequency get lower, or higher as the ambulance moves towards the person on the right?
The frequency gets higher as it moves towards the person on the right.
What is the Doppler effect?
The Doppler effect is a change in frequency of a wave for an observer moving relative to its source.
This is an observer.
This is an observer.
The ambulance is the source that is moving.
The wavelengths are getting closer as the frequency gets higher.