Light travels much faster than sound. One of the most classic examples is lightning. When lightning strikes, the first thing you see is a flash of lightning in the sky, while the sound of thunder is heard a few seconds later.
Italian physicist Galileo Galilei made a simple experiment with the help of lanterns in 1638. He and a friend each took a lantern and drove miles apart. As soon as one of them signaled with the lantern, the other gave the signal to him. Galileo divided the distance between two...