Question

The intensity of the sound of a subway train was measured at 108 dB. Find the intensity in W/m2. (Give your answer in scientific notation, correct to one decimal place.)

Answer 1

I = 0.0631 W/m²

Explanation:

Value in Decibel = 10 Log
`(I)/(10^(-12) )`

108 / 10 = Log
`(I)/(10^(-12) )`

10.8 = Log
`(I)/(10^(-12) )`

`(I)/(10^(-12) )` =
`10^(10.8)`

I =
`10^(10.8)` x
`10^(-12)`

I = 0.0631 W/m²