This occurs because the sound waves are compressed, resulting in a higher frequency being perceived by the observer. According to newton's law of inertia, an object which is moving will continue its motion if the forces are balanced When a vibrating object is moving away from an observer, the measured frequency of the vibrations will be lower than if the object and observer are both stationary.
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When a vibrating object moves away from an observer, the waves it emits are stretched, leading to a lower frequency being perceived
This is why the measured frequency decreases when the object is receding.
If the vibrating object is moving (toward, away from, along side) an observer, the measures frequency of the vibrations will be higher then the actual rate of vibration of the object. Drag each statement into the correct bin based on whether it describes motion that involves acceleration or motion at constant velocity For the motions that are on earth (e.g., car, ball, elevator), ignore any effects of earth's rotation or orbit.
