Archive for the ‘Cool Stuff’ Category

How loud is a rock concert ?

January 11, 2011

The Decibel (dB) scale measures noise in objective terms.

On the Decibel scale, each 10 points [dB(A)] added represents 10 times as much sound.

For example; 70 dB(A), is not 17% louder, but ten times as loud as 60 dB(A).

  • Threshold of human hearing: 0 dB(A)
  • Soft whisper: 20 dB(A)
  • Refrigerator: 50 dB(A)
  • Normal conversation: 60 dB(A)
  • Dishwasher running: 55-70 dB(A)
  • Busy street traffic: 70 dB(A )
  • Car interior: 75 dB(A)
  • Vacuum cleaner: 80 dB(A)
  • Common home stereo: 80 dB(A)
  • Lawn mower: 90 dB(A)
  • Rock concert: 110 dB(A)

http://library.rusbiz.com/article_index.html?cat=123&id=34092&seo_name=Quiet_Air_Purifier_-_What_You_Should_Know_Before_Purchase

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Cool viewing: Playing for change …

July 9, 2009

These songs and videos have been making the rounds.
(Over 12 million Youtube views)

The theme: street singers around the world.

Worth a view when you need a pick-me-up.

   ==> click to play         

image

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