I was watching an old documentary called "Einstein's Universe" from the seventies with Peter Ustinov. They were at a large observatory, outside by the railing, one story above ground, testing Galileo's theory of gravity using two weights of 1 KG and .25 KG of the same shape so air does not...
Summary: What can we tell about the medium a wave has traveled through?
What can a wave tell us about the media, whether it is space, water, air or whatever, that it has passed through? Does it have some "memory" or hint of what it has previously passed through? I am thinking mostly of...