Question

Sound becomes hazardous noise pollution at decibels

• A. above $120db$
• B. above $80db$
• C. above $50db$
• D. above $30db$

Answer 1

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 $H_z$ (the unit of frequency).
7. Decibel is a measure of intensity.
8. Sound becomes hazardous noise pollution above $80db$.

Hence, option B is correct.