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Speed of Light
Denoted with the symbol "c," the speed of light is 299,792,458 metres per second and is often rounded as 300,000 kilometres per second or 186,000 miles per second.
1,290 Questions
How small would Betelgeuse have to get to have its escape velocity equal the speed of light?
It is difficult to determine has the mass of Betelgeuse is poorly constrained. Estimates range between 8 and 20 times the mass of the sun. For this mass range, the diameter would have to be between 47 and 118 kilometers (29 and 73 miles) for the whole mass of Betelgeuse to form a black hole.
The speed of light in vacuum is exactly 299.792,458 m / s
The speed of light in air is roughly 299,702,458 m / s
sun's rays are made up of a mixture of seven colors. it is apparent in the rainbow. oxygen and nitrogen occupy not less than 98% of the gases in the air. blue light in the sun's rays are scattered when it hits those gases.
What is the speed of light when traveling through cesium vapor?
According to the Princeton experiment, a speed of 57,747,544 miles per second was achieved.
What is the approximate speed of light in kilometer per second?
What is the approximate speed of light in kilometer per second?"
What colors is most reflected violet red black or white?
-- Violet is most reflected by things that look violet, like pansies.
-- Red is most reflected by things that look red, like fire engines.
-- White light is the mixture of all colors. It's reflected most by things
that reflect all colors, like chalk and white shirts.
-- Black is not a color. It's the absence of light of any color. Things that absorb
light of every color and reflect no light of any color look black.
I'm not sure what that 'a' is doing in there. I'll just go with 2.5 x 109 Hz.
Wavelength = speed/frequency = 3 x 108/2.5 x 109 = 12 centimeters or 1.2 x 108 nm.
This is no "X-ray". This is more like the radio waves in your microwave oven that are used to warm the leftover meatloaf for a quick supper.
Is spearfishing hard with refraction?
Yes, spearfishing can be more challenging due to refraction, which distorts the appearance and position of fish underwater. It may require the spearfisher to aim slightly lower than where they see the fish in order to make an accurate shot. Practice and experience can help in adjusting for refraction to improve success in spearfishing.
i think the answer is that {it is my own thinking answer}
when light enter from air to water it bent because it want follow a principle which is light take same time to travel in same distance in air and water therefore when it enter water it reduce speed so obiviously it take more time to travel a given distance then in air so to follow the principle that it take same time time to travel in air and water ,light bent inorder to decrease distance so by decreasing distance it will take same time
What is the index of refraction of sugar?
Crystaline sugar (sucrose) has a refractive index of around 1.56. Sugar solutions can have refractive indices greater than this. Note, that the refractive index of a substance can even be determined for opaque substances. This is because the RI also determines reflective properties. So by measuring the amount of light reflected by light shining on a polished sample at a given angle, a refractive index can in principle be obtained.
Does convection travel at the speed of light?
No but the leader that travels from the cloud to the ground travels at about 60 000 m/s.
Light travels at 300 000 000 m/s.
Note that the bright flash of lightning occurs on the return stoke and travels from the ground up to the cloud.
Read the article on lightning at Wikipedia.org, 'The World's Encyclopedia'. The link is in the related links below.
Is the speed of light slower in air or in a vacuum?
Speed of light is max. in vaccum and slower in air.
His groundspeed is 204 mph, in the direction of 348.7 degrees .
What is the exact speed of light in a vacuum?
The current internationally accepted number is: 299,792,458 meters per second.
Note. While the number above is correct, it is not 'the current internationally accepted number'. The number is now correct by definition. Physicists world-wide have agreed that c is 299 792 458 m s-1.. Physical constants are usually quoted with 'error bars', which indicate the accuracy of measurement. Here there are no error bars - what you see is what you get, and what physics will get ever after. The second is now defined by an atomic clock, and the meter is defined by reference to c and the second. If there were to be a tiny error that had crept in, the meter is what would change.
Light speed is constant but why Einstein take square in his equation?
Partly to ensure that the dimensions of the equation balance.
Those speeds are equal, even though the speed of the light
was temporarily less while it was inside the glass.
What mach is the speed of light?
The question has no sensible answer: the Mach number is the speed of an object in a medium compared to the speed of sound in the same medium. Light, and other electromagnetic radiation travel fastest in vacuum. Since sound cannot travel in vacuum its speed in vacuum is 0 and so the Mach number for light requires division by zero - which is undefined.
The Mach number for light travelling in air is approx 873,300. In water, it is 202,000 and in diamond it is only 10,400.
The speed of light has been measured to be about?
The speed of light cannot be measured IN A WAY. However it travels at 1,079,252,848.8 miles per hour or 299,792,458 meters per second. It cannot be measured however the numbers I showed is one way. Light cannot have a specified measurement, unless the light source is big or small etc...
What is the average constant speed of light in vacuum?
The speed of light in vacuum is 299,792,458 meters per second,
and that's not an average. That's what it always is.
Is speed of light all different speeds?
As long as it stays in one medium (substance), the speed of all wavelengths of
visible light is very close to the same number. It only changes when the light
crosses into a different substance, like going from air into water, or from glass
into jello.
What is the speed of light in kilometers per second in a diamond whose index of refraction is 2.42?
123,881.181 km/sec
If both speeds are measured in the same medium, whether it be
vacuum, water, or jello, then they are equal.
How fast is the speed of light?
In vacuum, the speed of light is -- 299,792,458 meters per second
-- 186,282.397 miles per second. If you were to travel at the speed of light, you could go around
the Earth's equator approximately 7.6 times in one second.
(Flying in a typical passenger jet, at a ground speed of 500 mph,
it would take 4 hours to cross the continental US.)
