At a distance of `20m` from a point source, the loudness is `30dB`. After a minimum distance of `k``(``300``sqrt(10)``)``m` the sound is inaudible. Value of `k` is

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?

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_(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.

What is the minimum distance of the obstacle from the source of sound for hearing distinct echo ?

Distance of propogation from antenna of height 20m is

Distance of propogation from antenna of height 20m is

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

Intensity level at a distance 200 cm from a point source of sound is 80 dB. If there is it loss of acoustic power in air and intensity of threshold hearing is 10^-12 W m^-2 , then the intensity level at a distance of 4000 cm from source is (log 20 = 1.3)

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.

A person is standing at a distance D from an isotropic point source of sound He walks 50.0 m towards the source and observes that the intensity of the sound has doubled. His initial distance D from the source is