At a distance `r_(0) = 20 m` form an isotropic point source of sound the loudness level is `L_(0) = 30 dB`. Neglicting the damping of the sound wave, find : (a) the loudness level at a distacne `r = 10 m` form the source, (b) the distance form the source at which sound is not heard.

At a distance 20 m from a point source of sound the loudness level is 30 dB . Neglecting the damping, find (a) the loundness at 10 m from the source (b) the distance from the source at which sound is not heard.

At a distance r = 100 m from a isotropic point sources of sound 200 Hz the loudness level is L = 50 dB . The standard intensity level, i.e., intensity level just audible to human ear is I_(0) = 0.1 n W//m^(2) . Find the sonic power of the source.

Explain why the loudness of a sound note varies with the distance from the source of sound

At a distance of 5.0 m from a point sound source, the sound intensity level is 110 dB. At what distance is the intensity level 95 dB?

Loudness of sound from an isotropic point source at a distace of 70cm is 20dB . What is the distance (in m) at which it is not heard.

A plane sound wave propagates along the x axis . The damping coefficient of the wave is gamma=0.0230 m^(-1) . At the point x=0 the loudness level is L=60 dB . Find : (a) the loudness level at a point with coordinate x=50 m , (b) the coordinate x of the point at which the sound is not heard any more.

The sound level at a distance of 3.00 m from a source is 120 dB. At what distance will the sound level be (a) 100 dB and (b) 10.0 dB?

A point source of sound radiates energy at the rate of 3.14 watts. Find the intensity level of loudness at a distance of 15.8 m from the source in dB (approximately) ? (take pi=3.14 )