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2006-12-02 20:58:32 · 4 answers · asked by kadhir p 1 in Science & Mathematics Physics

4 answers

The unit of acoustical (or electrical) power measurement with respect to a standard level is one bel.

The interval between two powers W1 and W0 in bels is log (W1/ W0).

In practical work one-tenth of bel, decibel is used.

Threshold of hearing 0 dB.
Quiet conversation 50 dB.
Loud conversation 70 dB.
Threshold of pain 130 dB.

Whether it is MUSIC OR NOISE the same unit is used for measurement.

There is no separate unit for noise;

2006-12-02 21:16:43 · answer #1 · answered by Pearlsawme 7 · 0 0

the audible range goes from 0 to 120 dB absolute

0 in absolute dB = 10^-12 W

So ,in watt 10^-12< audible range< 1 watt

2006-12-02 21:55:54 · answer #2 · answered by maussy 7 · 0 0

0 to 120 db

2006-12-03 01:33:54 · answer #3 · answered by openpsychy 6 · 0 0

194 Theoretical limit for a sound wave at 1 atmosphere environmental pressure; pressure waves with a greater intensity behave as shock waves.
180 Krakatoa volcano explosion at 1 mile in air [1]
160 M1 Garand being fired at 1 meter (3 ft)
150 Jet engine at 30 m (100 ft)
140 Low Caliber Rifle being fired at 1m (3 ft); the engine of a Formula One car at 1 meter (3 ft)
130 Threshold of pain; civil defense siren at 100 ft (30 m)
120 Train horn at 1 m (3 ft). Perforation of eardrums.
110 Football stadium during kickoff at 50 yard line; chainsaw at 1 m (3 ft)
100 Jackhammer at 2 m (7 ft); inside discothèque
90 Loud factory, heavy truck at 1 m (3 ft)
80 Vacuum cleaner at 1 m (3 ft), curbside of busy street, PLVI of City
70 Busy traffic at 5 m (16 ft)
60 Office or restaurant inside
50 Quiet restaurant inside
40 Residential area at night
30 Theatre, no talking
20 Whispering
10 Human breathing at 3 m (10 ft)
0 Threshold of human hearing (with healthy ears); sound of a mosquito flying 3 m (10 ft) away

2006-12-02 22:32:57 · answer #4 · answered by Anonymous · 0 0

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