How many times faster is the speed of light in a vacuum than the speed of sound air?
100% - sound is vibration of atoms/molecules - it cannot travel
through vacuum
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The idea of "speed pf sound in a vacuum" is meaningless; sound
cannot travel without a medium such as air, water, metal, stone, or
SOMETHING. Sound waves are mechanical vibrations; there has to be
something to vibrate.
The speed of sound in air is around 700 miles per hour, while
the speed of light is 186,000 miles per SECOND.