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Graphics Interchange Format  |  2001-10-24  |  12.6 KB  |  640x480  |  4-bit (8 colors)
   ocr: Arial 10p pt - : - BI - I U Z f(x) Volume Le A1 VOLUME LEVELS (Decibels) VOLUME LEVELS(Uecibels) Decibels are on a loganthmic scale 3dB increase = Double Intensity 3dB decrease = Halve Intensity 10dB increase - 10X Intensity 10dB decrease = 1/10 Intensity Example of noise source Decibels Intensity Quietest sound which can be heard 0 1 Quiet whisper 20 100 Birdsong 35 3162 Atter 11pm, £100 fine for exceding noise leaking to neighbour 35 3162 Watching TV in a room (few metres from TV) 50 100000 Noral conversation 50 100000 Carc conversation 60 1000000 Busy office 60 1000000 Crowded pub 75 -100 3 ...