Questions

1. Why is there a delay in hearing the sound of the clap and its associated echo?
   (The clap travels a short distance to your ear. The echo's travel is much longer, from your hand to the wall and back to your ear)
2. Suppose the speed of sound was 688 m/s. How would this affect your observations?
   (You'd have twice as many claps and returns in the same one-second period. The calculated distance to the wall, however, would still be the same.)
3. Why was it important to maintain a steady beat?
   (To determine the time for a round trip, you needed to overlap the sound of a clap with the echo from the previous clap. This required a steady beat from which an average time could be taken.)