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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