Light vs. Sound
Sound travels fast but
light travels a whole lot faster. You’ve probably noticed that when you see
lightning, you don’t hear thunder until several seconds later. That’s because
the light reaches you before the sound.
The speed of sound in
air varies depending mainly on temperature (sound also travels faster through
liquids and many solids). A jet travelling at about 761 miles per hour is
considered to be flying at the “speed of sound”. But this is nothing compared
to light. In a vacuum, such as in space, it goes 186,000 miles per second!
Scientists don’t think anything in the universe can travel faster than that.
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