Which of the following describes the wavelength of the sound you hear as an emergency vehicle's siren moves away from you?

Question

Group of answer choices

The received wavelength diminishes completely.

The received wavelength is longer than the one emitted at rest.

The received wavelength is the same as the one emitted at rest.

The received wavelength is shorter than the one emitted at rest.

Answer 1

When an emergency vehicle's siren moves away from you, the sound waves are stretched due to the Doppler effect. This leads to the wavelength received by you being longer than the wavelength emitted at rest.

Therefore, the correct choice is:

The received wavelength is longer than the one emitted at rest.