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CBSE Class 9 Answered

what is the difference between crests and rarefactions ,troughs and compression ?
Asked by | 09 Dec, 2013, 09:15: PM
answered-by-expert Expert Answer
When the wave is moving through air, the air is being compressed at the wave crest and the air is being rarefacted on the trough. 
 
Crests represent maximum amplitude of a wave, which is analogous to compression which represent maximum density regions.
 
Troughs represent minimum amplitude , which is analogous to rarefactions which are low density regions.
 
So, the comparision between crest/troughs and compression/rarefractions is made between the amplitude (intensity) to the density (pressure).
Answered by Komal Parmar | 10 Dec, 2013, 07:14: AM

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