- #1

fluidistic

Gold Member

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## Main Question or Discussion Point

This is weird, I have no clue on how to solve the following question that I "invented" while walking in the street due to car sounds.

I know that the intensity of sound -let's say the source of sound is a dot/point- decreases as 1/r² do. If I'm at a distance 1 m, I can hear 4 times "stronger" than if I'm at 2 m from the source. Now if I approach the point source I'll be getting an extremely loud sound and if I eventually reach the point-like source, I'd get an infinitely loud sound. I know this doesn't happen in reality so I went wrong somewhere.

Where did I go wrong?!! I really can't see!

Edit: I know I should reach a finite value, say [itex]I_0[/itex]. But as r tends to 0, I(r) seems to tend to [itex]\infty[/itex].

I know that the intensity of sound -let's say the source of sound is a dot/point- decreases as 1/r² do. If I'm at a distance 1 m, I can hear 4 times "stronger" than if I'm at 2 m from the source. Now if I approach the point source I'll be getting an extremely loud sound and if I eventually reach the point-like source, I'd get an infinitely loud sound. I know this doesn't happen in reality so I went wrong somewhere.

Where did I go wrong?!! I really can't see!

Edit: I know I should reach a finite value, say [itex]I_0[/itex]. But as r tends to 0, I(r) seems to tend to [itex]\infty[/itex].