Which of the following dots would hear the lowest pitch from the ambulance? Yellow Dot, Blue Dot, Red Dot, Green Dot
Understand the Problem
The question is about the Doppler effect. The question is asking which colored dot would perceive the lowest pitch from the ambulance, based on the diagram showing the ambulance as a wave source.
Answer
Green Dot
The Green Dot would hear the lowest pitch from the ambulance, due to the Doppler effect causing a decrease in frequency as the ambulance moves away from it.
Answer for screen readers
The Green Dot would hear the lowest pitch from the ambulance, due to the Doppler effect causing a decrease in frequency as the ambulance moves away from it.
More Information
The Doppler effect explains why the pitch of a siren changes as it passes you. When the ambulance is moving towards you, the sound waves are compressed, resulting in a higher frequency (higher pitch). As the ambulance moves away, the sound waves are stretched, resulting in a lower frequency (lower pitch).
Tips
A common mistake is to think the closest dot will hear the lowest pitch. However, the Doppler effect depends on the relative motion between the source and the observer.
Sources
- Explainer: the Doppler effect - The Conversation - theconversation.com
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