Why does a police siren change its note as it races past you?
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Family time
A story to share together
Get comfortable. Make a guess together. See where the story takes you.
Everyone gets a guess. You don’t need to know the answer before you begin.
After the story: things to talk about
- Next time a siren passes, guess together whether the note will go up or down right as it goes by.
- Talk about how the siren itself never changes — only its motion does. Why does that fool our ears?
- Name three things that make this 'EEEE...ooohh' sound: ambulance, race car, what else?
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