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An observer notes that the pitch of a sound is becoming progressively lower. The observer can conclude that the sound is moving
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An observer notes that the pitch of a sound is becoming progressively lower. The observer can conclude that the sound is moving

User Danack
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The source of the sound is moving away from the receiver.
User Aaren Cordova
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He can conclude that the source of the sound is moving away from him and that its speed is increasing.
User Labanino
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