It’s hard not to stop what you’re doing and watch when a fire truck comes barreling down the road with its sirens blaring. But once the truck passes, something strange occurs: the sound of the siren changes pitch. Why is that?
In this lesson, students come up with equations in several variables to explore the Doppler Effect
, which explains how sound from a moving object gets distorted. Along the way, they’ll explore the relationship between the wavelength, frequency, and pitch of a sound, and will also explore what happens when an object breaks the sound barrier.