How Loud is Too Loud? Video
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| 28.8k/14.4k
= 166sec. |
56k/ISDN
= 112sec. |
T1/Cable
= 6sec. |
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Scientists measure the loudness
of sounds in units called "bells", named after the inventor of the telephone,
Alexander Graham Bell. Talking softly is about 30 decibels. Speaking in
a normal way is about 60 decibels. But an airplane, a boom box, or a rock
concert can be 100 to 140 decibels, and that is loud enough to cause a
permanent hearing loss.
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