Question

click the formula sheet to access resources for your test. question 21 (1 point) listen which of the following statements accurately describes the changes in sound waves associated with the doppler effect? sound waves experience an increase in frequency when the source of the sound is moving away from the observer sound waves experience a decrease in frequency when the source of the sound is moving away from the observer sound waves experience a decrease in frequency when the source of the sound is moving towards the observer when a sound source is stationary and the observer is moving towards it, there is no observable change in the sound waves.

Explanation:

The Doppler Effect states that when the source of a sound is moving away from the observer, the sound - waves experience a decrease in frequency (a redshift in the case of light - like waves). When the source is moving towards the observer, the frequency increases. If the source is stationary and the observer is moving towards it, there is a change in the observed frequency.

Answer:

Sound waves experience a decrease in frequency when the source of the sound is moving away from the observer.