If one PC creates a noise level of 20dB and another makes 40dB of noise, roughly how much louder is the second computer?
Two times louder
Four times louder
Ten times louder
Eight times louder
Correct Answer:Four times louder
A little background…
Instead of increasing linearly, decibels follow a logarithmic scale that raises by powers of ten and every 10dB roughly equates to a doubling in loudness based on the average human hearing. That being the case, 30dB is around twice as loud as 20dB and a computer making 40dB of noise would be about four times louder than one generating 20dB.
A PC producing only 20dB of noise would be considered a pretty quiet system while a typical office is around 40-50dB and comfortable hearing levels are said to be under 60dB. A siren 10 meters away and speakers at a rock concert are around 110dB, heavy weapons and space rockets are 180-190dB and at 194dB sound waves become shock waves.