the doppler effect is a change in the of sound waves that occurs when the source of the sound waves is…

the doppler effect is a change in the of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener.
Answer
Brief Explanations:
The Doppler effect for sound waves is characterized by a change in frequency when the source moves relative to a stationary observer. This is due to the compression or stretching of the sound - wave fronts.
Answer:
frequency