n tell me where do u find i mean in website ...................
2007-09-11 06:59:59 · 17 answers · asked by bhu bob 1 in Science & Mathematics ➔ Astronomy & Space
669,600,000MPH.
300,000,000m/s
2007-09-11 07:05:58 · answer #1 · answered by Steve C 7 · 2⤊ 0⤋
In metric units, c is exactly 299,792,458 metres per second (1,079,252,848.8 km/h).[2] The fundamental SI unit of length, the metre, has been defined since October 21, 1983, as the distance light travels in a vacuum in 1/299,792,458 of a second; any increase in the precision of the measurement of the speed of light would refine the definition of the metre, but not alter the numerical value of c. The approximate value of 3×108 m/s is commonly used in rough estimates. In imperial units, the speed of light is about 670,616,629.2 miles per hour or 983,571,056 feet per second, which is about 186,282.397 miles per second, or roughly one foot per nanosecond.
The speed of light when it passes through a transparent or translucent material medium, like glass or air, is slower than its speed in a vacuum. The ratio of c to the observed phase velocity is called the refractive index of the medium. General relativity explains how a gravitational potential can affect the apparent speed of distant light in a vacuum, but locally light in a vacuum always passes an observer at a rate of c.
2007-09-13 03:34:08 · answer #2 · answered by sairam y 2 · 0⤊ 0⤋
Easiest way is to use Google's built-in calculator. Type this into any Google search box:
c in mph
("c" is the recognized symbol for the speed of light.)
Also,
c in km/s
c in m/s
2007-09-11 07:05:23 · answer #3 · answered by RickB 7 · 0⤊ 0⤋
The speed of light, known as "c" = 3 x 10^8 meters/second. Look it up in any engineering/science property website.
2007-09-11 07:09:49 · answer #4 · answered by Jim M 3 · 1⤊ 0⤋
As for the website you should go to a serach engine such as Yahoo! (one you're at now), google, askjeeves.com etc...
You SHOULD know that c (the speed of light) is a constant. This constant is 2.9979 x 10^8 m/s.
In order to convert this to km/h:
-First convert the m to km: 1 m = 0.001 km
2.9979 x 10^8m/s x ( 0.001 km / 1 m ) = ??? km/s
-Now, convert the s to hr: 3600 secs = 1 hr
??? km/s x ( 1 hr / 3600 secs ) = ??? km/h
Notice how these were both done, you really just want to cancel out all the units that you want to get rid of and gain new units.
I hope this helps!
Good luck!
Love,
Mary
2007-09-11 07:15:54 · answer #5 · answered by ♥ Mary ♥ 3 · 0⤊ 1⤋
This is the actual figure for the speed of light.
299 792 458 m / s
1076.4 Km/hour
668.844 MPH
2007-09-11 07:20:51 · answer #6 · answered by kiron p 3 · 0⤊ 2⤋
light travels at a constant, finite speed of 186,000 mi/sec. A traveler, moving at the speed of light, would circum-navigate the equator approximately 7.5 times in one second. By comparison, a traveler in a jet aircraft, moving at a ground speed of 500 mph, would cross the continental U.S. once in 4 hours.
2016-05-17 06:55:13 · answer #7 · answered by ? 3 · 0⤊ 0⤋
I checked into that about a week ago. I don't know kilometer from potatoes but in mph it's approximately 66 million. I rounded it off and multiplied 186,000 miles per second times 60 to get miles per minute and that figure times 60 to get mph.
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You can read more about it here:
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http://en.wikipedia.org/wiki/Speed_of_light
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2007-09-11 07:15:00 · answer #8 · answered by ericbryce2 7 · 0⤊ 0⤋
Speed of light :
- = 648x10^6 MPH;
- = 1.078x10^9 km/h;
= 299792458m/s
csep10.phys.utk.edu/guidry/violence/lightspeed.html -
en.wikipedia.org/wiki/Speed_of_light
2007-09-13 17:11:01 · answer #9 · answered by sb 7 · 0⤊ 0⤋
Its 3 x 10 to the power of 8 m/s.Its sixth grade portion.
2007-09-14 20:08:29 · answer #10 · answered by HAREESSH PRABU S 1 · 0⤊ 0⤋
speed of light is 186000 miles/second. multiply that by 3600 to get 669,600,000 mph, multiply that by 1.6 to get 1,071,360,000 km/h
speed of light in meters per second is 3.00 x 10^8
my brain... calculator
2007-09-11 07:11:43 · answer #11 · answered by mcdonaldcj 6 · 0⤊ 0⤋