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Question

Sound becomes hazardous noise pollution at decibels


A

above 120db

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B

above 80db

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C

above 50db

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D

above 30db

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Solution

The correct option is B

above 80db


Explanation for the correct option:

  1. Sound is the vibration of particles in a medium.
  2. It is a form of energy as well.
  3. Noise is the unwanted and undesired sound that discomforts humans.
  4. 1db (decibel) is defined as the smallest frequency the human ear can hear.
  5. It is a logarithmic measure in base 10 meaning, 10 times the loudness of 1db is 2db.
  6. It is not directly proportional to Hz (the unit of frequency).
  7. Decibel is a measure of intensity.
  8. Sound becomes hazardous noise pollution above 80db.

Hence, option B is correct.


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