For the Doppler Effect to occur, . Question 25 options: the sound source must be moving the listener must be moving both source and listener must be moving either source or listener must be moving PLEASE HELP

A) Either source or listener must be moving.

Explanation:

Frequencies can shift if an observer is moving relative to the wave’s source. This type of shift is called the Doppler effect (often used to analyze sounds). Think about the sound you hear when a police siren passes you and drives away; as the car increases its distance from you, the pitch of its sound becomes lower. This is because each wave is emitted from a greater distance, causing the wavelength to spread out or increase relative to you, the listener.

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i really dont know but i will try okay.

so i think u would just add all them up and get your answer..