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18 September, 12:27

Why does a siren have a lower pitch as it moves away from you?

O

The troughs of the sound wave are spaced closer together,

O

The crests of the sound wave are farther apart.

O The period of the sound wave is decreased,

O

The amplitude of the sound wave is increased,

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  1. 18 September, 13:12
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    the second one. the crests of the soundwave are farther apart
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