Speed of Light

The appearance of a pencil (e.g., bending when immersed in water) is due to the change in speed of light waves as they pass from one medium to another. This change causes the light waves to refract, leading to the appearance of the pencil being altered from the observer's perspective.

Light waves change speed when they travel from air into the material of the pencil, and then change speed again when they exit the pencil back into the air. This change in speed causes the light waves to refract or bend.

You haven't said anything about where the children are located. After all,

the time it takes him to visit all of them doesn't really depend on how many

there are. It depends more on how spread out they are. If they're all sitting

in one huge stadium, for example, he can do it in one single stop.

Santa begins at bedtime on Christmas Eve for the child who lives farthest east,

and he ends at sunrise on Christmas Day for the child who lives farthest west.

That gives him roughly 33 hours to complete job.

If your figure is accurate, and there are in fact 880 million kids on his list, then

he needs to average 262/3 million kids per hour, or about 7,407 kids per second.

Sounds daunting, I know. But he's been at it a long time, and his skills and technique

have come a long way since he was promoted to the job.

The speed of light in a vacuum is approximately 670,616,629 miles per hour.

Sunlight is actually light waves of different frequencies. Some of these waves are part of the visible light spectrum (ROYGBIV), and therefore sunlight appears white, a combination of all the frequencies in the visible light spectrum. Light waves with lower frequencies appear more red or orange. Light waves with higher frequencies appear violet or blue. When sunlight shines down through the atmosphere, the particles in the air scatter the light waves of higher frequencies, therefore spreading the waves in different directions in the sky (This is why the sky appears blue). The lower frequency waves reach our eyes mostly undisturbed. Since sunlight has light frequencies dominant in yellow, that's the color we see.

The speed of light is only the speed limit for information. There are many experiments showing that we can made "non-information" travel faster than the speed of light. For example, in quantum mechanics the phase velocity is faster than the speed of light but the group velocity is slower (or equal to) the speed of light. Also, if two light waves are traveling at the speed of light and they interact, e.g. they constructively interfere with each other, the interference can travel faster than the speed of light. Once again, the speed limit of light is only on information. The word "information" is sometimes tricky to define though.

It travels at approx 220,000,000 metres per second.

Photons do not travel through time.

This is due to the fact that the faster you travel through space, the slower you travel through time. In other words, if an object is standing still, it is traveling at the speed of light through time, and since a photon travels at the speed of light through space, it is not traveling through time.

--

Asker here, I hope no one minds me editing in to expand on the question/answer given.

Surely the answer must be more complex. If a photon does not travel through time, then that could potentially violate/invalidate causality.

cuz crack in a glass means there wud be a layer of air in the crack.thus when light rays muv 4m glass to air that is denser to rarer medium,as we all knw, Total internal reflection occurs.as a result,light rays get refleted to our eyes,so a shine seems to appear on d crack.

That would mean the second gear would be 1000 miles per hour and a jump of 900 miles per hour per gear change.

2.988 X 10^8 m/s (1 mile/1609 meters)(3600 seconds/1 hour)

= 6.71 X 10^8 miles per hour/900

743308 gear changes to reach light speed

The lens of the eye, specifically the ciliary muscles surrounding it, can change its shape to adjust the amount of refraction. This process, known as accommodation, allows the eye to focus on objects at different distances by changing the curvature of the lens.

When light waves enter a material like glass or water, they slow down due to interactions with the atoms in the material. This change in speed is related to the optical density of the material, causing the light waves to bend, i.e., refract. Once the light waves exit the material, they resume their original speed in the air.

No, Albert Einstein suggested the idea of travelling at the speed of light and what would occur to physical properties, which lead him to special and general relativity.

However, he never said it was possible to do so.

Quite the opposite actually, he discovered that as an object travels faster and faster through space, it requires more and more energy to go even faster, to the point that if an object were to travel onward to the speed of light, it would require all of the energy in the universe to push it to that speed. It's also known as relativistic mass.

Light travels at the speed of light. There is no general velocity of light because velocity is a vector quantity, it also contains a direction and there is no preferred direction for light rays in general.

Another answer:

The speed of light has been calculated to be 186,000 miles per second.

Data 'speed' and the 'speed of light' are two different animals. The distinction

may be too abstruse for you, but I'll try to make it:

"Speed" is how many miles you drive or run in an hour ... distance/time .

Data speed is more like a frequency ... how many words can you read in 1 minute,

or how many onions can you peel in an hour, or how many bytes can you transmit

through a wet noodle in one second.

You would never ask: How many megabytes per second can this snowmobile go ?

3E8 m/s = 3x(10^8) m/s = 300000000 m/s = Three Hundred Million meters per second

When the convexity of the lens is increased, the lens becomes thicker in the middle. This change causes light to refract more strongly, focusing light rays to a point closer to the lens. In the eye, this can help correct nearsightedness by bringing the focal point forward onto the retina.

Wavelength and frequency are inversely related to each other when it comes to the speed of light. As the wavelength of light increases, the frequency decreases, and vice versa. However, the speed of light remains constant in a vacuum at approximately 3.00 x 10^8 meters per second.

The speed of light is typically given in meters per second when determining wavelength. This is because the wavelength of light is directly related to its speed and frequency through the equation: speed = frequency × wavelength.

It is usually expressed the other way: the ratio of the speed of light in a vacuum to the speed of light in a medium. In that case, it is called the "index of refraction".

The scientific name for the speed of light is "speed of light" or "c." In equations, it is often represented by the letter "c," which stands for "celeritas," the Latin word for speed.

Yes, the wavelength of light from a second order spectrum will be more accurate than that of a first order spectrum because it provides additional data points for analysis. Second order spectra can help reduce errors and provide more precise measurements of wavelength.

For constructive interference in a double slit setup, the path length difference between the two waves is equal to a whole number of wavelengths plus a half-wavelength. In this case, for the second constructive fringe (m=2), the path length difference is 1.5 times the wavelength: 1.5 x 500nm = 750nm.