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Decibel is
1. Musical instrument
2. Unit of sound
3. The wavelength of noise
4. None of the above

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Correct Answer - Option 2 : Unit of sound

The correct answer is Unit of Sound.

  • The sound is all around us and can be measured to protect and inform us, as some sounds are not safe. In fact, loud noise can actually damage our hearing. So, the intensity of a sound is measured using decibels.
    • As the human ear is incredibly sensitive, you can hear everything from your fingertip brushing lightly over your skin to a loud thunderclap. As far as power is concerned, the sound of the thunderclap is approximately 1,000,000,000,000 times more powerful than the smallest audible sound. 
  • Decibel is the unit of sound. Its symbol is dB.
    • On the decibel scale, 0 dB is the smallest audible sound.
  • A sound 10 times more powerful is 10 dB.
  • A sound 100 times more powerful than near total silence is 20 dB.
  • A sound 1,000 times more powerful than near total silence is 30 dB.

  • The audible range of sound for human beings extends from about 20 Hz to 20000 Hz (one Hz = one cycle/s). Children under the age of five and some animals, such as dogs can hear up to 25 kHz (1 kHz = 1000 Hz). 

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