A window whose area is `2 m^(2)` opens on a street where the street noise results at the window an intensity level of `60 dB`. How much acoustic power energy from the street will it collect in a day?

Answer

A, B, C

Explanation

By definition sound level `= 10 log.(I)/(I_(o)) = 60`
or `(I)/(I_(o)) = 10^(6)`
rArr `I = 10^(-12) xx 10^(6) = 1mu W//m^(2)`
power entering the room
`= 1 xx10^(-6) xx 2 = 2mu W`
Energy collected in a day `= 2 xx10^(-6) xx 86400`
`= 0.173 J`