## Essential University Physics: Volume 1 (3rd Edition)

We use the equation for intensity to find the value of x, which we will call the distance that you need to be at: $x = r_{15}\sqrt{\frac{I_{15}}{I_x}}=15 \sqrt{\frac{750}{270}}= 25 m$ Subtracting this from where you started, we find: distance $= 25-15=10\ m$