Question

Please include as detailed an explanation as possible with equations and concepts written out.

1. In old cowboy movies, you have probably seen someone place his ear on railroad rails to tell if a train is coming. Why is this done, and how does it work? Explain your reasoning.
2. There is a biological reason why a church does not need an organ pipe longer than 4.0 m. What is that reason? In many churches there are much longer pipes. What is their effect? Explain your reasoning.
3. When a gong is sounded, it produces sound waves in air. If the same gong were struck in a vacuum, would it continue to vibrate for less time, for the same amount of time, or for more time than it does when struck in the same way in air? Explain your reasoning.

Thank you :)

Answer 1