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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

Why does light changes its colour after passing through some transparent coloured like a red coloured transparent piece of glass or any such glass or matter?

When light passes through a colored transparent material, certain wavelengths of light are absorbed by the material while others are transmitted. The transmitted light has a different color because it is missing the wavelengths that were absorbed by the material. This causes the light to appear as a different color when it exits the material.

Why convex mirrors are used in shopping malls?

Convex mirrors in shopping malls are used to provide a wider field of view for security purposes, allowing security personnel and staff to monitor different areas simultaneously. The convex shape also helps to eliminate blind spots and improve visibility around corners, aiding in preventing shoplifting and ensuring overall safety within the mall.

How long will it take if you traveled at the speed of light to get from earth to a comet?

Assuming the comet is far away in the outer solar system, it would take light approximately 8 minutes to reach Earth from the Sun, and then more time to reach the comet depending on its distance. Traveling at the speed of light, it would take a few minutes to several hours or more to get from Earth to a comet, depending on its specific location in space.

Is time reversal possible in theory?

In theory, time reversal is possible based on the laws of physics, particularly in quantum mechanics. However, in practical terms, achieving time reversal remains a significant challenge due to the complexity and energy requirements involved. Additionally, time reversal is generally understood to be a theoretical concept rather than a physical reality that can be readily observed or utilized.

Is it possible to be faster than the speed of light?

Einstein theorises that if one were to travel at the speed of light he would be in a place of timelessness. This maybe because past, present and future are an illusion and actually happen simultaneously.

If our consciousness (or imagination if you prefer) were to travel at the speed of light then would we be in a place of timelessness? I am answering a questions with a question, I know, but perhaps someone can comment further and shed some light on the matter (pun intended)

What is the sound when a plane flies faster than the speed of light?

As soon as the plane speeds up to go faster than sound, it may generate a

'sonic boom', which continues to sweep over the ground wherever the plane

flies. Faster than that, there's no particular magic speed at which anything new

suddenly magically happens. No aircraft, balloon, rocket ship, bullet, or anything

else can fly faster than the speed of light.

What is the effect on the speed of light when temperatures rise in the medium?

When temperature rises, the density of the medium changes. Speed of light through a medium is inversely proportional to the density of medium. So when the temperature increases, the density decreases and the speed of light in that medium increases. Note that this is the indirect effect of temperature. If light is travelling through vaccuum , then the temperature will have no effect on the speed of light.

Sound travels through the air at 343 miles per second at 20 degrees Celsius and A bat emits an ultrasonic squeak and hears the echo 0.05 seconds later so How far away was the object that reflected it?

.05 x 343 meters (not miles) = 17.15 meters

That's the total distance covered by the squeek, from bat to bug and back to bat.

So the distance from the bat to the bug is 1/2 of that = 8.575 meters = about 28 feet.

Inspiringly, there are many blind people who have developed the ability to make

soft mouth clicks and navigate by the echos, and they're very good at it.

What is the speed of light in centimeters per minute?

The speed of light is approximately 18,000,000,000 centimeters per minute.

What would breaking your pencil in half be an example of?

Breaking a pencil in half could be an example of physical change, where the pencil's form is altered without changing its chemical composition.

Is it true or false the second postulate of special relativity says that the speed of light in empty space depends on the motion of the source or of the observer?

False. The speed of light in empty space is a constant, independent of the motion of the source/observer. An observer travelling towards or away from a light source at 99% the speed of light would measure light going the same speed as an observer stationary relative to the light source.

A blackbody curve relates the wavelength of emitted light to?

the intensity of radiation emitted at that wavelength, giving a characteristic spectral distribution that depends only on the temperature of the object emitting the light.

Can nothingness No matter energy etc Travel faster than light If so how fast?

Think about that question. When you say nothing that means that there is nothing to measure the speed of. And nothing can move faster than light, nothing, There is a fixed amount of speed something can have. As speed increases time slows down and at light speed no time passes therefore it is impossible for anything or "nothing" in your questions case can move faster than light.

Then again im only 15 so i could wrong but i am answering to the best of my knowladge.

How could human thought travel 24 billion miles per second?

Human thought does not travel at a physical speed like light or sound. It is a neurological process that occurs within the brain at a much slower pace. Communication can travel at the speed of light through technologies like fiber optics, but human thought is a complex internal process that does not have a measurable speed in terms of distance covered per second.

Is density and speed of light an inverse relationship?

I believe it is. Nobody else does though.

Light travels as a wave, just as sound travels as a wave. The speed of light should be inverse to the compression density (and other conditions) of the medium through which it travels. Otherwise we MUST stop describing it as a wave. The very definition of a wave presumes a medium through which it propagates. Light is an omni-directional wave, much like a shockwave, and like a shockwave, it will can be affected in one direction, but unhindered in another by conditions of the medium. Not to render this answer unusable, but I believe that electromagnetic waves are produced by sub-atomic particles breaking the light barrier when super-energized to great speed.

How long in years would take to travel 57 trillion km in light years?

Light travels at a speed of 300,000 kilometers per second. To convert 57 trillion kilometers to light years, we divide by the speed of light: 57 trillion km / 300,000 km/s = 190 million seconds. Converting this to years, it would take approximately 6 years to travel 57 trillion kilometers in light years.

How does time changes at speed of light?

At speeds approaching the speed of light, time slows down in two ways, which in actuality are the same way observed from two frames of reference. If you're standing still and something is moving close to the speed of light relative to you, time is slower for it. If you're moving at close to the speed of light and everything else is standing still, time is still slower for everything else. Why? Because if you change reference frames from the objects that are standing still's point of view back to your point of view, then it is no longer you that is traveling close to the speed of light, but is in fact everything else that is.

This effect is called time dilation, and has been experimentally verified time and again. The equation to measure how much slower time passes for different reference frames is actually quite simple:

Δt' = Δt/√[1 - (v2/c2)], where v is the relative speed of what's moving compared to that of a stationary observer, c is the speed of light, Δt is the time elapsed by the observer's watch, and Δt' is the time that has elapsed by the object that is moving's watch.

What contains all wavelengths of light?

answ2. Well, not many. Even a fluorescent lamp does not give out all colours, but our eye compensates for that.

o If you hold the shiny side of a CD or DVD towards a fluro lamp, you'll only see a few discrete colours - green, blue, violet, red and so on. Depends on the lamp.

o You've just used your CD as a diffraction grating (similar to a prism). And revealed the colours emitted by the phosphors in the fluoro tube.

o If you repeat the experiment using either sunlight or an incandescent light as the light source, you'll see an almost continuous spectrum.

A1. Because when something is something it does it.

Can the speed of light be calculated?

Answer: The speed of light was determined through experimentation, such as the timing of moons passing behind Jupiter. Many formulas are based upon the speed of light, but that number had to be determined beforehand.

Light travels 299,792,458 meters per second (or 186,282.397 miles per second in a vacuum.

Answer: Yes, the speed of light can be deduced from the electrical properties of empty space. However, in practice it is more accurate to measure the speed of light.

What convinced scientists that light is a particle?

The photoelectric effect experiment conducted by Albert Einstein in 1905 provided strong evidence that light behaved like particles, later termed photons. This experiment demonstrated that light could transfer energy in discrete packets, or quanta, rather than as a continuous wave. Subsequent experiments, such as Compton scattering, further confirmed the particle-like behavior of light.

Can the speed of light bend time?

Yes, according to Einstein's theory of relativity, time can be influenced by gravity and high speeds. This means that the speed of light can indeed affect the flow of time, leading to phenomena such as time dilation.

What light goes through the greatest refraction?

Violet light undergoes the greatest refraction as it has the shortest wavelength among the visible light spectrum. This causes it to bend the most when entering a medium with a different refractive index.

Does the speed of light depend on wavelength?

No, the speed of light in a vacuum is constant and does not depend on wavelength. However, light can travel at different speeds in different mediums, such as air or water, due to interactions with the medium.

How the speed of visible light compare with gamma rays when both speeds are measured in a vacuum?

Visible light and gamma rays are different parts of the full spectrum of light. Since they are really both just light, they travel at the same speed, the speed of light. 186,000 miles per second.

Why does lighting the same place twice?

Lighting the same place twice can occur for several reasons, such as miscommunication between individuals responsible for the task, a malfunction in the lighting system, or human error. It is important to ensure clear communication and coordination to prevent this from happening.