'Eardrum' bursts at

  • 40 dB
  • 80 dB
  • 160 dB
  • 320 dB

The level of sound of normal conversation is

  • 10 dB
  • 20 dB
  • 50 dB
  • 60 dB

In concert halls, soft materials and carpets are used to

  • increase sound waves
  • absorb sound waves
  • retract sound waves
  • refract sound waves

One of the vibrations of the string makes

  • pitch of the instrument
  • pitch of the note
  • scale of the note
  • pitch of the scale

Sound waves are converted by

  • speakers
  • computers
  • microphones
  • monitors

Sound is measured by units that are called

  • Hertz (Hz)
  • Decibels (dB)
  • Meters (m)
  • Pascal (Pa)
0 h : 0 m : 1 s

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