Sound travels through air. If an ambulance or a fire truck or a police car is moving towards you, it compresses the air ahead of it and the pitch goes higher...
The explanation confuses the loudness of a sound with its pitch -- two different concepts.
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SciencewithDrJ
Yes, I realized that after it was posted, and others told me that too. Thanks for the note. This video targets younger viewers of middle school to high school and sometimes there is too much over simplification.
