Do sound waves die out or does a sound once made go on forever? What about light waves?
Sound waves behave like ripples in a pond after a stone has been thrown into it. The ripples get weaker and weaker due to friction of water and finally they lose their energy altogether and fade out.
Sound waves fade out for the same reason: they lose their energy due to friction of air.
Light waves are not affected by friction so they never die out. If we could travel fast enough to overtake light we would be able to see things that happened in the past, but of course travelling faster than light is impossible. Nothing in the Universe can travel as fast as light.
Picture Credit : Google
