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 What is the decibel of a baby's cry?

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What is a decibel (dB) ?

The decibel is derived from the bel, a unit of sound power measurement. It is actually a ratio, and has no meaning for absolute value:bel = log(P1/P2)decibel = 10*log(P1/P2)For actual sound measur... Read More »
http://answers.yahoo.com//question/index?qid=20070416012303AAa7nGA

What is a decibel meter?

A decibel meter, also known as a dB meter, is used by to put a numerical value on the subjective loudness of a sound.FunctionA decibel meter measures the sound-pressure level (SPL) of a given sound... Read More »
http://www.answerbag.com/q_view/1948188

What is the decibel level of a jet plane?

The sound of a jet plane at takeoff (100 feet) is approximately 120 to 130 decibels (dB). The sound of the engine of a stationary jet is approximately 140 decibels (dB). Prolonged exposure to sound... Read More »
http://www.answerbag.com/q_view/1982785

What is the decibel level of a smoke detector?

Smoke detectors, which intentionally are very loud so they'll be able to wake up a sleeping occupant in the event of a fire, generally are 85 decibels loud. Louder smoke detectors--along with ones ... Read More »
http://www.answerbag.com/q_view/1945960


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