#fire-engine

Fire engine - questions and answers. If you have a question about this topic, please click on the "New Question" button. If you wouldn't like to miss any new question in this topic, please subscribe.

> #fire-engine

Questions

Anonymous
Mar 30

When a fire engine goes by, why does the siren’s sound change?

Have you ever stood on a city sidewalk and heard the distant wail of an approaching fire engine? As the fire truck comes into view, the sound of its siren becomes louder and more frantic, the wail higher and higher pitched. Then, as it passes, the opposite effect occurs: The sound of the siren drops in pitch, getting lower and lower as the vehicle vanishes into distant traffic. But the fire truck’s driver hears no such change; to him, the siren that he flipped on 20 blocks ago has sounded at a steady pitch.

1 12
when-a-fire-engine-goes-by-why-does-the-sirens-sound-change
1 12

×





© 2020 - quanswer
To personalize content, tailor and measure ads, and provider a safer experience, we use cookies.
By using our site, you agree to our use of cookies on and off Quanswer.
Learn More