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Decibel is the unit of:

  • A.Speed of light
  • B.Intensity of heat
  • C.Intensity of sound
  • D.None of the above

Answer: C

The decibel measures the intensity, or loudness, of sound.

It is a logarithmic unit: every 10 dB is a tenfold increase in intensity, so 80 dB carries a hundred times the energy of 60 dB. Ordinary conversation is about 60 dB and a jet engine at close range about 140 dB.

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