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How many decibels is the sound of whispering laughter?

  1. Mar 13, 2009 #1
    How many decibels is the sound of whispering laughter?
     
  2. jcsd
  3. Mar 13, 2009 #2
    It's ~25 dB (SPL) from 1m away, depending on how loudly one whispers, I suppose. ~50 dB at 1m is the level of speech, and ~10 dB at 1m is the level of just regular breathing. The magnitude of sound decays with distance, so distance from the source needs to be considered.
     
    Last edited: Mar 13, 2009
  4. Mar 13, 2009 #3
    Just remember that decibels are based on a log scale. This means that 50dB is much more than 2 times as loud as 25dB. Every increment of 3dB you increase, it's about twice as loud.

    http://en.wikipedia.org/wiki/Decibel#Examples
     
  5. Mar 13, 2009 #4
    0 decibels SPL is about 10^-12 watts per square meter. 120 decibels SPL is about 1 watt per square meter. As indicated above, it is a logarithmic scale; every 10 decibels is a factor of 10 in watts/ square meter.
     
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