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Decibel is the unit for

  • A.Speed of light
  • B.Radio wave frequency
  • C.Intensity of sound
  • D.Intensity of heat

Answer: C

The decibel measures the loudness or intensity of sound.

It is logarithmic: 10 dB is a tenfold increase in intensity, so the scale can cover the enormous range the ear handles. Frequency, which determines pitch, is measured in hertz instead - cycles per second.

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