Definition of perk. intransitive verb. 1a : to thrust up the head, stretch out the neck, or carry the body in a bold or insolent mannerb : to stick up or out jauntily. 2 : to gain in vigor or cheerfulness especially after a period of weakness or depression âusually used with up he's perked up noticeably.
Quick Answer. Light travels at a considerably higher speed than sound. Light travels at a constant speed of 186,000 miles per second, but the speed of sound is only 761.2 mph.
Tweet Share Email. Up until midcentury, the fastest thing in the world, apart from light, was sound. Travelling at 343 meters per second (1230 kph or 767 mph), sound was faster than even the most devastating craft of war.