Question

Question #2e09c

Answer 1

`3.98xx10^-4Wm^-2`

Explanation:

Threshold of Hearing (TOH) is `0dB` and taken as `=1xx10^-12 Wm^-2`

Let `86.0dB=xWm^-2`

Implies that
`10 log(x/(1xx10^-12))=86.0`
`=> log(x/(1xx10^-12))=8.60`
Taking `"anti "log`
`=> x/(1xx10^-12)=3.98xx10^8`
`=> x=3.98xx10^8xx1xx10^-12`
`=> x=3.98xx10^-4Wm^-2`