29 A source of sound emits waves isotropically in three dimensions if the intensity at a distance r0 from source - Physics - Electromagnetic Waves

Question

29 A source of sound emits waves isotropically in three dimensions
if the intensity at a distance r0 from source is

Io,at what distance from the source is the intensity 0 100Io?

Jyoti Pant · Accepted Answer

We have a relation,I=P4πr2i e
 I α 1r2Suppose the intensity is 0
100 I0 at a distance x from the source
I(r0)I(x)=x2r02I00 100I0=x2r0210
1=x2r02or 10=x2r02or x2=10r02or x=r010

29.A source of sound emits waves isotropically in three dimensions.if the intensity at a distance r0 from source is Io,at what distance from the source is the intensity 0.100Io?

29.A source of sound emits waves isotropically in three dimensions.if the intensity at a distance r₀from source is_{Io,at what distance from the source is the intensity 0.100Io?}