Correct Answer - Option 1 : B
The correct answer is B.
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Sound is measured in Decibel.
- SI unit of Force is Newton.
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Sone is the unit of loudness.
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One sone is arbitrarily set equal to the loudness of a 1,000-hertz.
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Phons is also a unit of loudness.
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0 phons at 1000 Hertz equals 0 decibels.
- The loudness of a sound depends upon the amplitude of vibration.
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The Pitch of the sound is determined by its frequency.
Some important decibel values are:
| Type |
Value |
| Soft music, whisper |
30 dB |
| Average home noise |
40 dB |
| Normal talking |
60 dB |
| Vacuum cleaner, Normal music |
75 dB |
| Heavy traffic, noisy restaurant |
80-89 dB (sound above 85 dB is harmful to human beings. |
| Stock car racing |
130 dB |
| Gunshot, siren |
100 feet - 140 dB |
| Aeroplane at 100 feet |
185 dB approx |
