One second.
light can travel around earth about seven times
Light cannot travel around the Earth, since light travels at a straight line and the Earth is round. The speed of light is 300,000 kilometers per second.
Light could travel seven and a half times around the world in one second.
speed of light = 299792458 m/s time it takes light to travel around the world = 40075160/299792458 = 0.134 seconds time it takes light to travel around the world 7+1/2 times = 1.005 seconds
Light doesn't actually go around the Earth; light travels in generally straight lines. But if light DID go around the world, it could go around the world seven times in just less than one second.
I believe it takes light from the sun about seven minutes to reach earth and moon. And light travels at 186,000 miles pre second !
The shockwaves from the Krakatoa volcanic eruption in 1883 traveled around the Earth seven times. The eruption was one of the most powerful volcanic events in recorded history.
Light travels about 1,860,000 miles in 10 seconds, which is roughly seven times around the Earth.
At the speed of light it would take take just over an hour. By conventional rocket: the Cassini probe took seven years to reach Saturn. Pioneer 11 took 6 years
LIGHT travels at about 670,616,629.384 miles per HOUR, not per second!Converting m.p.h. to miles per second, then the approximate speed of light would be about 186,282 miles per second.IF lightning travels at the speed of light (which it doesn't!) then 186,282 miles in one second divided by the approximate circumference of the earth, i.e. 25,000 miles, equals 7.45, or say seven and a half times round the earth, or once every 1/7.45 = 0.13 seconds.However! Lightning does not travel as fast as light! It has been approximated that lightning, on average, travels at about half the speed of light. So, one continuous flash of lightning, in a tight circle close to the earth, could travel round the earth 3.725 times, approximately.-----------------------------------------Note: I agree the " tethering " of the cloud and the earth via the electrons and protons from each, does not travel at the speed of light.However; this connection between the two creates an "electrical bolt" which in turn creates a flash of light, which, as the name suggests, does travel at 300,000 kms/sec i.e. the speed of light.-------------------------------------------For more information, see 'Related questions' and 'Related links' below.
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