I watched it beffore I even found this site! It was so great I was up all night thinking about it... Truely amazing...(and educational) what channel is pbs is on?
This should answer the question if you read throught it... It was enough for me...
This is an elementary subject. ok first let me correct a statement made earlier sound wave aren't how radios work. Radio work by using radio waves not sound waves although eventually the radio waves are converted...