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What is intensity of sound in normal conversation?
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- 10—20 decibel
- 30—60 decibel
- 70—90 decibel
- 120—150 decibel
Correct Option: B
The word noise is taken from the latin word nausea and is defined as unwanted or unpleasant sound that causes discomfort.
| Source | Intensity (dB) |
|---|---|
| Breathing | 10 |
| 20 | |
| Trickling clock | 30 |
| Library | 30 – 35 |
| Normal conversetion | 35 – 60 |
| Telephone office Noise | 60 – 80 |
| Alarm clock | 70 – 80 |
| Traffic | 50 – 90 |
| Motorcycle | 105 |
| Jet fly over | 100 – 110 |
| Train whistle | 110 |
| Air craft | 110 – 120 |
