When an ambulance passes you, the pitch seems to change as it speeds by. This is called the Doppler Effect. Please use complete sentences in your answer. 1-Describe what happens to the sound waves as the ambulance approaches you. How would you hear the sound waves? (2 pts.)

2-Describe what happens to the sound waves as the ambulance moves away from you. How would you hear the sound waves now? (2 pts.)

Answer & Explanation:

As the ambulance approaches you, the distance between the source of the waves and the observer decreases. As a result, the siren sounds more shrill as the pitch of the wailing siren sounds "higher" than its original value, as sound waves reach you more frequently due to the shorter distance.

The opposite occurs when the ambulance moves away from you. The distance between the ambulance (source of sound waves) and the observer increases. As a result, the siren sounds less shrill and sounds "lower" than its original value since the wave reach you less frequently given the greater distance.

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