Answer:
The question should be correctly written as:
The particles of longitudinal waves vibrate by pushing together and moving apart parallel to the direction in which the wave travels. The place on the wave that is pushed closest together is called the _____ and the place that is pulled farthest apart is called the _______
The answer to the question is:
The particles of longitudinal waves vibrate by pushing together and moving apart parallel to the direction in which the wave travels. The place on the wave that is pushed closest together is called the <u>compressions</u> and the place that is pulled farthest apart is called the <u>rarefactions.</u>
Explanation:
Longitudinal waves are waves consisting of a periodic disturbance or vibration in which the displacement of the individual particles of the medium is parallel to the direction of wave travel. In other words, longitudinal waves are waves that move in the same direction, or are parallel to their source. Examples of longitudinal waves include: sound waves. ultrasound waves. seismic P-waves.
A compression is where the particles of the medium are closest together, it happens when molecules are forced together. Compression is like the crest or peak of the wave.
Rarefaction occurs when molecules are given extra space and allowed to expand. Rarefaction is the opposite of compression and is where the particles are stretched apart and they are regions of low pressure.
A demonstration of compression and rarefaction can be seen in sound waves, where, sound waves can be regarded as a succession of compressions followed by rarefactions.
