Question

reflect on your prediction

1. observe the distance between the compressions shown in the image. what do you notice about the sound waves in front of the truck compared to the sound waves behind the truck? was your prediction correct?

type your answer here.

Explanation:

This illustrates the Doppler effect: when a sound source (the truck) moves toward an observer, the sound wave compressions in front are squeezed closer together, while those behind are stretched apart.

Answer:

The sound waves in front of the truck have a shorter wavelength (the distance between compressions is smaller) compared to the sound waves behind the truck, which have a longer wavelength. This matches the expected Doppler effect for a moving sound source.