The threshold of hearing for the human ear is 10-12 W m -2 . This is taken as the standard level. The intensity of sound is 1 W m -2. Expressed in decibel, it has intensity

Question

The threshold of hearing for the human ear is 10-12 W m -2 . This is taken as the standard level. The intensity of sound is 1 W m -2. Expressed in decibel, it has intensity (A) 1012 db (B) 12 db (C) 240 db (D) 120 db

Tardigrade Admin · Accepted Answer

Here, Decibel level =10 log 10((1 Wm -2/10-12 Wm -2)) =10 log 10 1012=12 × 10 db =120 db

Q. The threshold of hearing for the human ear is $1 0^{- 12} W m^{- 2} .$ This is taken as the standard level. The intensity of sound is $1 W m^{- 2}$ . Expressed in decibel, it has intensity

$1 0^{12} d b$

$12 d b$

$240 d b$

$120 d b$

Here, Decibel level $= 10 lo g_{10} (\frac{1 W m ^{- 2}}{1 0 ^{- 12} W m ^{- 2}})$
$= 10 lo g_{10} 1 0^{12} = 12 \times 10 d b = 120 d b$

Q. The threshold of hearing for the human ear is 10−12Wm−2. This is taken as the standard level. The intensity of sound is 1Wm−2. Expressed in decibel, it has intensity

1012db

12db

240db

120db