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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
Speed of light kilometers per hour?
The velocity of light in a vacuum is 299,792,458 m/s.
Which is 2.99792458 x 105 km/s in scientific notation, or approximately 3 x 105 km/s.
How how many miles would it take to travel 1 light year from earth and 1 light year back?
WikiAnswers contributors enlighten us:
- 2 years - traveling at the speed of light (not taking into account pit-stops for coffee).
- Of course it depends on how fast the object is traveling. In one of the NASA Space Shuttles, about 76,526 earth years(38,263 earth years one way). 1 light-year is 5.8 trillion miles and the maximum speed of a NASA Space Shuttle is 17,500 miles per hour.
The fastest unmanned space craft traveled 157,000 mph. At that rate, there and back would take only 8,500 earth years. So if you were a Mesopotamian farmer in 6,500 BC, you'd be getting home right about now.
- Not only would this depend on the speed you are traveling, but it also depends on your point of view: If you were to be inside a spacecraft traveling at the speed of light, it would take you 2 years, but it would seem as if no time at all had elapsed!
- At our current level of technology, and allowing for no fundamental breakthroughs in physics but allowing for reasonable engineering development along known lines, the fastest spacecraft that we are currently capable of building would be an Orion Nuclear Pulse Rocket. Wikipedia has a good general description at the link below, but the basic concept is that we build a REALLY BIG spacecraft - perhaps twice the mass of a current US Navy aircraft carrier - and set off nuclear bombs behind a gigantic bowl and shock absorber. Such a device ought to be able to attain about 10% of the speed of light, but it would take about 2 years to reach that speed, and two years to slow down and stop. We would NEVER send out such a ship one light-year out and come back; we'd keep going to a potentially habitable star, but IF we needed to, we could probably do it in about 100 years.
Does the speed of light have air in it?
No, the speed of light is a fundamental constant in physics and does not contain air or any other material substance within it. It is the speed at which light travels in a vacuum.
How much energy would it take for an electron to move at the speed of light?
Simply put, it would in theory require infinite energy. This is obviously not possible, at least not by our current understanding of physics. Therefore, once again in theory, nothing of ANY mass could be accelerated to the speed of light.
How does these two quantities determine the speed of light?
The speed of light is determined by two fundamental physical constants: the permittivity of free space and the permeability of free space. These constants are intrinsic properties of the vacuum and dictate how fast electromagnetic waves, such as light, can propagate through space. The speed of light is given by the equation c = 1/√(ε₀μ₀), where c is the speed of light, ε₀ is the permittivity of free space, and μ₀ is the permeability of free space.
Is a proton larger or smaller than an electron?
Protons have a larger mass, but it is unclear which (if either) have a larger radius. The electron does not seem to have ANY measurable radius.
What is the speed of light in meters per second?
The speed of light in a vacuum is exactly 299792458 m/s
How fast dose the speed of light travel?
The speed of light travelling in a vacuum is said to be exactly 299,792,458 meters per second. Remember this is in a vacuum, for if the light were to pass through some transparent material, such as glass or water it would marginally slow down.
The main difference between speed and velocity?
The main difference between speed and velocity involves direction. Velocity involves an object moving in a particular direction.
When was the speed of light measured?
The speed of light was first measured in 1676 by Danish astronomer Ole Rømer using observations of the moons of Jupiter. Rømer's work provided the first quantitative estimate of the speed of light.
How do they determine the speed of light?
-- Measure the distance between two points or objects. The farther apart
they are, the more accurate your final measurement of the speed will be.
-- Measure the time it takes a beam or a pulse of light to travel from
one of them to the other one. Alternatively, put a mirror at one point,
and measure the time it takes the light to go there and come back.
-- Divide the measured distance by the measured time. The quotient
is the speed of the light. If you used the mirror arrangement, then the
speed is double the quotient.
Do neutrinos travel at the speed of light?
No, neutrinos have been shown to have a small non-zero mass. They can't get to c (the speed of light in a vacuum). The only thing a supernova can eject at the speed of light is photons.
Update: Recently an experiment has measured neutrinos traveling above the speed of light. An explanation is yet to be offered.
What does The International Committee on Weights and Measures designates the speed of light as?
They don't designate the speed of light, but they do define the meter as
1/299,792,458 of the distance that light travels in one second in vacuum.
Who was the first person to give numerical value to the speed of light?
One of the earliest numerical values given for the speed of light (excluding Aristotle's 'infinite') would be that given by the 14th Century Indian scholar Sayana, given in his commentary on the Rigveda. Eerily enough, when converted to modern units, the value is remarkably close to the modern experimental value; this is probably a remarkable coincidence (see Subhash Kak, "The Speed of Light and Puranic Cosmology").
Probably the earliest published empirical value for the speed of light was obtained by Ole Christensen Romer in 1676. By observing the difference in time it took for the moons of Jupiter to orbit around the giant planet when it was closest to Earth, and when it was furthest from Earth. This gave an approximate value of 227 thousand kilometers per second, which is about 75% of the modern accepted value.
What is the speed of light through water and why?
To calculate the speed of light in any medium (like water) start with the speed of light in a vacuum (exactly 299,792,458 meters per second) and divide it by the index of refraction of that media. In most cases you can round off the speed of light to 299,800,000 meters per second.
The index of refraction of water is about 1.33; so the speed of light in water is about 225,400,000 meters per second.
The speed of light in a vacuum is approximately 186,282 miles per second or about 299,792 kilometers per second.
Are nao seconds faster than the speed of light?
No. It's not possible to go faster than the speed of light. The speed of light takes all the energy in the universe and if you somehow did manage to get going that fast you would cease to exist.
What is the speed of light in 8 th grade?
The speed of light is approximately 186,282 miles per second or 299,792 kilometers per second. It is a constant value in a vacuum and is the fastest speed at which energy and information can travel in the universe.
What is 99.999999 percent of the speed of light?
99.999999 percent of the speed of light is approximately equal to 299,792 kilometers per second, which is nearly the speed of light in vacuum. At such high speeds, relativistic effects become significant, causing time dilation and length contraction.
What happens if 2 protons collide at the speed of light?
The short answer is: they can't. Protons, or any other particle that has mass, can't go at the speed of light because it would take infinite energy to get it going that fast. In particle accelerators, they make protons collide at a speed very slightly less than the speed of light, something like 99.99% of the speed of light. It takes a lot of energy to get the protons going that fast, and all of that energy is released in the collision, hopefully making some interesting results.
Why do gamma rays travel as fast as the speed of light?
The speed of light (3x10^8 m/s) as it is an electromagnetic wave and they all travel at this speed in a vacuum. This number can be used for gases as well as the molecules are so spread out at normal temperatires Same as speed of light "C". Gamma Rays are also form of Electro Magnetic Radiations. All EMR incl Light travel at same speed in same medium.
Which is normally approximated to 3 x 10^8 m/s
Read more: What_speed_do_gamma_rays_travel_at
The speed of light in vacuum is approximately 186,282 miles per second.
What are the SI units for speed of light?
Wavelength is in meters, the frequency is in hertz. period is in seconds and the wave speed is in meters per second.
Which is faster the speed of light or the speed of soundd?
Electricity.
Sound, whether in air, water or a solid such as steel, is a compression wave that moves atoms back and forth. It is slow. In air, the speed of sound is 343 meters per second (1,126 ft/s), or 1,236 kilometers per hour (768 mph). It takes 3 seconds to travel one kilometer or 5 seconds to travel one mile. It is 4 times faster than that in water and almost 15 times faster in iron.
Electricity involves the motion of electrons, very small and light with a significant long range Coulomb force between them. Electricity can be pictured as moving electrons which push against their neighboring electrons that in turn push against more distant neighboring electrons and this all continues for distances much much greater than the region occupied by a single electron. In some ways, this propagation by pushing against the neighbors is basically similar for both electricity and sound. But, for electricity the masses of the moving electrons are much much smaller than the masses of atoms and forces on electrons are longer ranged and strong.
Electrical disturbances on a conductor travel at almost the speed of light, but depends on the geometry of the conductor. For normal wires and normal electrical current such as used by people in everyday life, the speed can be over 95% of the speed of light. The speed of light is 300,000 kilometers per second. For other arrangements of conductors (waveguides) it can be much slower and a speed of 200,000 kilometers per second would not be surprising.
One is not far off if one says that the speed of light is 1 million times faster than the speed of sound.
What are the Applications of gauss law?
Gauss's Law is generally used to calculate the the total electric flux through any closed surface or the total charge that is enclosed by that surface.
Realize that a closed surface is constructed. To find the flux across an open surface, you must construct a Gaussian surface to enclose the segment that is being analyzed.
Hope that helped a little, Gauss is difficult bu practice will help alottt!!
