Answer:
r=

Explanation:
Power output has a formula : P=4πIr²
To solve formula for the distance from source, r . We first begin with:
P=4πIr²
we just need the value of r, so:
4πIr² = P
Cross multiply 4πI
r² =

Now taking square root, we get :
r =

r =

which is the distance 'r' from the source of a sound with power output of P