_____ are the places in a longitudinal wave where particles of matter are farther apart. Group of answer choicesrarefactionscompressionstroughscrests
Question
_____ are the places in a longitudinal wave where particles of matter are farther apart.
Group of answer choices
- rarefactions
- compressions
- troughs
- crests
Solution
The correct answer is rarefactions.
In a longitudinal wave, rarefactions are the regions where particles of matter are spaced farther apart. This occurs as the wave energy travels through the medium, causing alternate regions of compression (where particles are closer together) and rarefaction (where particles are more spread out). The terms "crests" and "troughs" typically refer to parts of transverse waves, not longitudinal waves. Therefore, among the given choices, rarefactions specifically represent the areas of decrease in pressure and density, where the particles are least tightly packed.
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