Posted by john on Wednesday, December 1, 2010 at 5:47pm.
The cabin noise level of the new Airbus 380 is 5 decibels lower than that of a 747 Jumbo Jet. By what factor does the noise intensity decrease?

physics  Henry, Thursday, December 2, 2010 at 11:04pm
db = 10log(p2/p1) = 5.
The negative sign means p2 is less than p1 and the ratio is less yhan 1.
10log(p2/p1) = 5,
Divide both sides by 10:
log(p2/p1) = 0.5,
p2/p1 = 10^0.5 = 0.316.

physics  Ali, Friday, January 18, 2013 at 6:17pm
db = 10log(p2/p1) = 5.
10log(p2/p1) = 5,
Divide both sides by 10:
log(p2/p1) = 0.5,
p2/p1 = 10^0.5 = 3.16.
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