- 3

- 0

I have used the formula Velocity = Frequency/Wavelength to determine the Wavelength of the sound in air (0.94 m) and in the pipe (3.74 m), but after that I'm stuck. My book gives the answer as 82 m, but no working is shown to help me understand why. I know that the sound will reach the other side via the air first, and can work out how far the sound will travel through the pipe in 0.3 seconds, but don't know how to calculate the total distance (circumference) or the diameter of the circular fence. Arrrgh, my brain hurts!

**1. The problem statement, all variables and given/known data**

**2. Relevant equations**

**3. The attempt at a solution**