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20,000 Hz (20kHz) is the (ideal) highest FREQUENCY that a healthy human ear can hear. With regard to loud sounds, a sound LEVEL of 120 decibel (dB) causes pain, and a level of 140 dB causes deafness.
Eloise Upton
Wiki User
∙ 14y agoIt's hard to give a meaningful reference level, but the decibel scale - used to measure sound level - is defined so 0 dB is the lower threshold of hearing.
On the dB scale, a jack hammer is around 100 dB, talking is 40-60 dB, leaves rustling are 10 dB. And 0 dB is then the lowest you can hear.
Wiki User
∙ 13y agoAbout 0 decibel, give or take a few decibel.
Wiki User
∙ 11y ago0db
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