Class VIII

Regions where molecules are compressed are called
  1. rarefactions
  2. compressions
  3. digressions
  4. progressions
Ultrasound and infrasound are not detected by
  1. humans
  2. animals
  3. birds
  4. all of them
Distance from one crest to another or one to another wave is called a
  1. wavelength
  2. frequency
  3. amplitude
  4. all of them
Wavelength of high frequency sound wave is
  1. longer
  2. shorter
  3. same
  4. constant
An instrument which can produce a number a sounds with high and low frequencies and pitch is the
  1. violin
  2. piano
  3. guitar
  4. double bass
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