Respuesta :

The Doppler effect is when the frequency of a sound changes as the position of you and the sound changes. For example, if a fire truck comes at you, the siren sound will increase, then, after it passes you, then the sound will decrease. The thing that just happened is the Doppler effect!

Have a nice day! :)
Xandra0
The false change in frequency that causes you to hear an item different depending on your location. If the objecting is approaching, it appears to get higher or louder while if it is leaving, it gets softer. 
 
**The frequency is not actually changing.

EX: A car honking its horn, speeding by. The person in front and behind the car hear two different sounds

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