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PLZZZ HELP!!!

Why does a siren have a higher pitch as it approaches you?

The amplitude of the sound wave is increased.

The crests of the sound wave are spaced closer together.

The troughs of the sound wave are farther apart.

The period of the sound wave is increased.

Respuesta :

iamathing

Answer:

The crests of the sound wave are spaced closer together.

Explanation:

the wavelength between successive crests is decreased due to the motion of the truck in the same direction as the sound

Answer and Explanation: The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. As the source of sound waves approaches a listener, the sound waves get closer together, increasing their frequency and the pitch of the sound.

Hopefully that helped!