A man strikes one end of a thin rod with a hammer. The speed of sound in the rod is 15 times the speed of sound in air. A woman, at the other end with her ear close to the rod, hears the sound of the blow twice with a 60 ms interval between, one sound comes through the rod and the other comes through the air alongside the rod. If the speed of sound in air is 343 m/s, what is the length of the rod?

Explanation

To find the length of the rod, we will follow these steps:

### Step 1: Determine the speed of sound in the rod
The speed of sound in air (VA) is given as 343 m/s. The speed of sound in the rod (VR) is 15 times the speed of sound in air.

\[ VR = 15 \times VA = 15 \times 343 \, \text{m/s} = 5145 \, \text{m/s} \]
...