How many times more intense is a 60 dB sound than a 30 dB sound ?

Options

A. 100
B. 4
C. 1000
D. 2

Answer

C

Explanation

`10logx=aB. thereforelogx=(a)/(10)dB`
`10logx=30dB. thereforelogx=3.thereforex=1000`.
`10logy=60dB`
`logy=6dB.y=10^(6)`.
`therefore` This sound 60 dB is 1000 times longer than 30 dB.