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Author Topic: What is sonic energy?  (Read 8126 times)

Kellogg

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What is sonic energy?
« on: 18/07/2008 10:08:58 »
David Kellogg asked the Naked Scientists:

What is sonic energy? How do you measure sonic vibration?

What do you think?


 

Offline RD

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What is sonic energy?
« Reply #1 on: 18/07/2008 15:45:37 »
Sonic = sound

Sound energy can be measured measured using a logarithmic decibel (dB) scale, or the linear Watts-per-square-meter (W/m2) scale...

Quote
Acoustics
dB(SPL) - dB (Sound Pressure Level) for sound in air and other gases, relative to 20 micropascals (μPa) = 210−5 Pa, the quietest sound a human can hear. This is roughly the sound of a mosquito flying 3 metres away. This is often abbreviated to just "dB", which gives some the erroneous notion that "dB" is an absolute unit by itself. For sound in water and other liquids, a reference pressure of 1 μPa is used.[6]

dB SIL - dB Sound Intensity Level relative to 10−12 W/m2, which is roughly the threshold of human hearing in air.

dB SWL - dB Sound Power Level relative to 10−12 W.
http://en.wikipedia.org/wiki/Decibel


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Sound levels for nonlinear (decibel) and linear (intensity) scales
       
dB  Wm2    type of sound

130 10     artillery fire at close proximity (threshold of pain)
120   1     amplified rock music; near jet engine
110 101   loud orchestral music, in audience
100 102   electric saw
 90 103   bus or truck interior
 80 104   automobile interior
 70 105    average street noise; loud telephone bell
 60 106   normal conversation; business office
 50 107    restaurant; private office
 40 108    quiet room in home
 30 109    quiet lecture hall; bedroom
 20 1010 radio, television, or recording studio
 10 1011 soundproof room
  0 1012 absolute silence (threshold of hearing)
 
Encyclopedia Britannica
« Last Edit: 18/07/2008 16:07:54 by RD »
 

lyner

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What is sonic energy?
« Reply #2 on: 18/07/2008 18:39:37 »
.. . . . . and you actually measure it using a good quality microphone, an amplifier, a detector of some kind and a display device (this is what a sound level meter contains, essentially). You calibrate it against a standard meter.
 

Offline RD

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What is sonic energy?
« Reply #3 on: 18/07/2008 19:18:30 »
 

lyner

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What is sonic energy?
« Reply #4 on: 19/07/2008 14:31:48 »
Precisely RD!
 

The Naked Scientists Forum

What is sonic energy?
« Reply #4 on: 19/07/2008 14:31:48 »

 

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