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Q: Compression and rarefaction are due to variability of :
  • A. Ray refraction
  • B. Magnetic difference
  • C. Temperature difference
  • D. Air pressure
Correct Answer: Option D - Waves are made up of compression and rarefactions. Compression happens when molecules are forced, or pressed together, rarefaction is just the opposite, it occurs when molecules are given extra space and allow to expand. Hence compression and rarefaction are due to variability of the difference of air pressure.
D. Waves are made up of compression and rarefactions. Compression happens when molecules are forced, or pressed together, rarefaction is just the opposite, it occurs when molecules are given extra space and allow to expand. Hence compression and rarefaction are due to variability of the difference of air pressure.

Explanations:

Waves are made up of compression and rarefactions. Compression happens when molecules are forced, or pressed together, rarefaction is just the opposite, it occurs when molecules are given extra space and allow to expand. Hence compression and rarefaction are due to variability of the difference of air pressure.