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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

What is faster than the blink of an eye?

a rapid movement of the eyelid to moisture the surface of the eye.

How long would it take to reach venus from earth at the speed of light?

At their closest, Venus and Earth are 40 million kilometers from each other. At the speed of light, 3 x 108 meters per second, that distance could be traversed in slightly over two minutes. At the furthest, Venus and Earth are 257 million kilometers from each other. At the speed of light, that distance can be traversed in slightly over 14 minutes.

Can a body reach the speed of light?

The short answer:

No.

The long answer:

The fastest manned vehicle record is held by a rocket, the Saturn V, on its return to Earth at the end of the Apollo 10 mission, achieving nearly 40,000 kph (just shy of 25,000 mph).

The (un-manned) New Horizons space craft is currently travelling at just under 55,500 kph (34,500 mph) en-route to Pluto.

The Voyager 1 probe was doing about 61,000 kph (38,000 mph) when it left the solar system. Both Voyager probes are still making their way through the Heliosheaf, and are still sending data back to Earth.

The fastest man-made object is the Helios 2 (solar observation) probe at 252,800 kph (157,100 mph). Helios 1 and 2 are no longer functioning, but are still orbiting the sun.

The speed of light (in a vacuum) is 1,079,252,850 kph (670,616,630 mph), which is, to put it mildly, rather a large gap.

Abandoning chemical rockets for advancing ion-based propulsion systems and solar sails, we may produce craft that greatly exceed all current speed records through the application of constant force over time. While they could take many years to achieve maximum speed, they would be capable of maintaining thrust for prolonged periods.

Even with all the time in the universe, there are other obstructions, however. The laws of physics, thus far in accordance with all predictions based upon Einstein's theory of relativity, dictate that as an object with mass approaches the speed of light, its mass will become infinite. The energy required to accelerate the object to light speed would be infinite. Even stranger, the length of the object or craft would become zero. These are impossibilities.

Knowing quite what happens at such velocities is something that we continue to strive for, and so far, everything that can be measured, whether it be the distance and velocity of astronomical objects, or readings taken of particles travelling at near-relativistic speeds in an accelerator, conforms to predictions using Einstein's theory.

At the very least, we can assume with some certainty that travelling at the speed of light would mean having to bend the physical laws of the universe in some weird ways. We have no idea if or how such laws can be bent, and we're certainly not going to achieve even near-light speeds with conventional rockets any time soon.

Why white light colours have different speeds according to their frequencies but not the other electromagnetic waves while all have the same speed of light?

Answer: The white colors have different speeds and not other electromagnetic waves because they are not usually consisted by more than one colors like the white colors.

Answer: You are really confusing two different things. (1) In a vacuum, all electromagnetic waves travel at the same speed. That includes light of different colors. They all travel at the so-called "speed of light" - without further qualification, this term means "the speed of all electromagnetic waves in a vacuum", and this speed is approximately 300,000 km/sec. (2) In materials other than a vacuum (empty space), electromagnetic waves get slowed down - and the amount by which they slow down depends on the frequency. Thus, not only light of different colors will be slowed down by different amounts, but also radio waves, ultraviolet rays, etc., if they are able to pass through a material at all. For more information, do some reading - for example, on the Wikipedia - on "index of refraction", and on "speed of light".

How much time has been taken by moonlight to reach the earth?

The average distance from the Earth to the Moon is 384,400 km retroreflectors have been placed on the moon and used to measure the distance by timing a pulse of light. the round trip time is about 2.5 seconds so a one way trip takes light about 1.25 seconds

What is the speed of 100 KG person at the earth's equator?

Are you talking about the speed of rotation of the Earth's surface at the equator ?

Angularly, that would be 1 rotation/day, or roughly 1,038 miles per hour linearly.

The man's mass makes no difference. When a group of people all get together at the

equator, we don't see the heavy ones racing ahead or lagging behind the light ones.

Why is infrared light faster than ultraviolet light?

That would be a very difficult "why" to explain, because it doesn't.

All light travels at the same speed in the same medium. In vacuum,

it's the speed we call "The Speed of Light". Shockingly, it's the same

as the speed of radio, TV, radiant heat, X-rays, gamma rays, WiFi,

and microwaves.

Does speed have magnitude only?

No, speed is a scalar quantity that only has magnitude and no direction. It is the rate at which an object covers distance. Velocity, on the other hand, is a vector quantity that includes both magnitude and direction.

Which of this speed are faster than the speed of a nerve messagespeed of electricityspeed of sound or speed of light?

The speed of light is faster than the speed of a nerve message, speed of electricity, and speed of sound. The speed of light in a vacuum is approximately 186,282 miles per second, while nerve impulses, electricity, and sound waves travel much slower.

What is the mass of a pebble going at the speed of light?

Given that:

M = m/(1-v2/c2)1/2

Where M is the relativistic mass, m is the rest mass, c is the speed of light in a vacuum and v is the velocity.

If v/c = c/c = 1

Then M = m/(1-1)1/2 = m/0

As the velocity of the pebble approaches the speed of light, its mass will tend to infinity. This is very unphysical as it means that the pebble will also have infinite energy and momentum which breaks several very fundamental conservation laws. In reality it would take infinite energy to accelerate a pebble to the speed of light, since infinite energy is not an option it must be true that no object with mass can travel at the speed of light.

Objects with reflection?

Mirrors, windows, smooth water surfaces, and metallic surfaces are examples of objects that can exhibit reflection. When light hits these surfaces, it bounces off and creates a reflected image of the surrounding scene. Reflection is the process where light rays bounce off a surface and change direction, allowing us to see objects that are not directly in our line of sight.

On your 2001 kia sephia w1.8l dohc 5spd you get a surging or bucking in any gear or speed when you're light on the throttle any idea what's wrong?

have diagnostics run firstjust ran into this recently and it's still being worked on. from a few mechanics, I've had the following suggestions:

check the timing belt (least likely)check spark plugs (could be misfiring)get the catalytic converter checked, as it could be clogged and preventing your car from exhausting properly

you can get full diagnostics run on it at any dealership, then taken elsewhere for the actual work, as the kia dealership I've had my car serviced at charged me $115 to spray brake fluid cleaner on my rear brakes.

Why does a light wave travel more slowly through gas than through a vacuum?

Because there are less molecules present in gases than, say, a solid. Sound travels through molecules, so if there are more molecules the sound will travel faster. For example, think of a bumpy country road and a smooth tarmac road. You'll travel faster along the tarmac right? This is because there's less bumps and gaps. The same idea works with sound. Less bumps = Smoother transition and therefore higher speed!

How do you get the value of the mass and speed of light?

The speed of light is roughly 300,000 kilometers per second.

You'll have to get your own mass.

When examining the three media in the lab which medium did you think would cause the most bending of light when the light passed through it?

There is insufficient information for us to even begin to understand this question. Please edit the question to include more context or relevant information. It would also be useful to develop the habit of checking your questions for completeness before posting them. This question contains no information on which three media were being examined.

What is an inferrance?

An inference is a conclusion or deduction reached based on evidence and reasoning rather than explicit information. It involves making an educated guess or assumption about something that is not directly stated.

How do you change the lights in the dash where the speed is at?

Hi, to change your lights in the speedometer(cluster),remove the trim piece from around the gauges, with a small flat screwdriver. Place tape on the metal end of the driver, as not to scratch the plastic trim. Gently and evenly pull off the trim cover. Now,thecluster has 6 to 8 screws, remove them with a magnet tip driver. With the screws out, now tilt the cluster out towards you . You'll see a wire harness attached to the back of the cluster. You can undo the harness from the cluster for easy bulb replacement .Remember ,when replacing bulbs make sure they're the correct size and watts. Best to check with your dealer or automotive shop. The cluster goes back in the same way. Also, the bulbs come out with only a half a trun.

Going 30 miles per hour on ice where should you stop before the light?

If your on "ice" and your driving 30 MPH you are going kinda fast unless you have chains or studs, best thing is to test your grip without other vehicles near by,

The law does not make concessions for weather: if there's a red light in front of you, you are still expected to stop for it normally ie at the stop line or before the sidewalk.

Is there any chance for humans to cover light speed?

Anything with a non-zero mass can never reach c (speed of light in a vacuum). Anything with a zero mass can only travel at c (speed of light in a vacuum). Photons, the particles of light, have zero mass.

That said things with a non-zero mass can travel faster than the speed of things with a zero mass, when they are traveling in a medium (e.g. air, water, glass, diamond). However when they do so they emit Cherenkov Radiation (usually a blue to violet glow) in their direction of travel. This is very loosely the light equivalent of the sonic boom shockwave when something travels faster than the speed of sound in a medium. This radiation eventually slows them down.

How long would it take to get to the M83 galaxy traveling at the speed of light?

M83 is quite a large galaxy, and it's not all at one place, so the length of your trip would depend on what part of M83 you were headed for. As an average, the distance to M83 is given as 15.81 MLy, so at the speed of light, the trip would take you 15,810,000 years. (Better take along a lot of clean underwear and reading material.)

Is it possible to see light move with a high speed camera?

Scientists have created a camera that has the ability to take 1012 (That is 1 with 12 zeros) FPS. And with a short enough pulse from a laser, they have the ability to watch the small beam move through space. You can see the research and many videos of this taking place on http://web.media.mit.edu/~raskar//trillionfps/ .

This should answer your question thoroughly.