Intensity of a sound wave from a point source, at a distance `r` from the source is `I` .The intensity at a distance `2r` will be :

If the amplitude of waves at a distance r from line source is A . The amplitude at a distance 4r will be

The intensity of sound from a point source is 1.0 xx 10^-8 Wm^-2 , at a distance of 5.0 m from the source. What will be the intensity at a distance of 25 m from the source ?

The intensity of sound from a radio at a distance of 2 metres from its speaker is 1xx10^(-2) mu W//m^(2) . The intensity at a distance of 10 meters would be

A hollow charged metal sphere has radius r . If the potential difference between its surface and a point at a distance 3r from the centre is V, then electric field intensity at a distance 3r is

The intensity of a wave emitted from a small source at a distance 10 m is 20 xx 10^(-3)"Wm"^(-2). What is the intensity at a distance 100 m ?

If A is the amplitude of the wave coming from a line source at a distance r, then :

The intensity of sound from a public loud speaker is 1mu "watt m"^(-2) at a distance of 5 m. What is the intensity at a distance of 100 m ?

The intensity produced by a long cylindrical light source at a small distance r from the source is proportional to

Find out electric field intensity due to uniformly charged solid non-conducting sphere of volume charge density rho and radius R at following points : (i) At a distance r from surface of sphere (inside) (ii) At a distance r from the surface of sphere (outside)

The intensity of the ground waves decrease with increase of distance due to