Answers

2014-07-29T09:05:56+08:00
Light does not require any medium to travel while Sound does require a medium to travel...
0
2014-07-29T15:35:17+08:00
Sound enery is mechanical and energy is electromagnetic 
0
Sound is caused by vibrations in matter; without matter, sound cannot exist.
Light is an electromagnetic wave; this wave travels the fastest when there is no matter present