Speed of Light

the speed of light never changes but when the light beam goes from air to water, it refracts. this is when the light beam alters direction because it hits an object of greater or less density (in this case it is higher).

21 million light years is an immense distance in space, equivalent to the distance light travels in 21 million years. To provide a sense of scale, the Milky Way galaxy is estimated to be about 100,000 light years in diameter, showing just how vast 21 million light years really is.

No 8.016 is faster if you're talking about time and speed

1 micrometer = 1.0 × 10-9 kilometers

So, 78 micrometers = 0.000000078 kilometers

It is technically impossible to accelerate to the speed of light. That would

require an infinite amount of energy. However, based on a simple, linear

equation: Going from 0-60 mph in 4.2 seconds is an average acceleration

of about 6.38 m/s2. The speed of light is 299,792,458 m/s. This gives us a

result of about 46,943,164 seconds, or 1yr 178da1hr46min. (rounded)

As of our current understanding of physics, it is not possible to travel faster than the speed of light. Even in millions of years, it is unlikely that we will find a way to break this fundamental limit imposed by Einstein's theory of relativity. Innovation may bring advancements in space travel, but exceeding the speed of light remains beyond our reach.

The reason we call a blue filter a "blue filter" is that it looks blue. The reason

it looks blue is that blue light is the only kind of light that can go all the way

through it. Any other color of light gets absorbed in the dyes between the

layers of the filter, and never comes out the other side. If you shine red light

at one side of a blue filter, the other side of the filter looks dark, as if nothing

is shining through it. And if you look at a 'red' sweater through a blue filter, the

sweater looks black.

Direction. When a wave is reflected from a mirror, its direction changes according to the law of reflection, which states that the angle of incidence is equal to the angle of reflection.

specularly reflecting surface

Try not to imagine light as like a baseball that slows down as it hits a denser medium (like water), and then (seemingly impossibly) speeding up as it goes back to a less dense medium (like air).

Light should instead be viewed as an electromagnetic wave, a wave that can be altered by the charged particles within a medium. How that EM wave is altered depends on the frequency with which the wave is vibrating and the nature of the charged particles in the medium.

When you do the calculations rigorously, you find that water molecules will cause this wave to propogate less slowly. When it leaves the water into air, almost no charged particles exist to alter the speed of propogation of this wave -- it instead travels at the speed Maxwell said such an EM wave would propogate.

Goggles help you see better underwater due to the change in the speed of light and the Brownian motion of the water. First, light slows down in water. Underwater, with the water pressing against your eyeball, the index of refraction changes and makes the lens in your eye out of focus. Browning motion causes a large number of molecules to pound away at your lens and keep it out of focus.

When you put on your goggles, then your eyes work like they do in air. Light is going at the speed of light. Water is not pounding against your lens getting it out of focus.

Air is transparent when you sit in the woods and look up to see the milky way. Then the wind shifts and the pollution rolls in. Starlight no longer illuminates your path. Whereas before you saw all the stars on the star chart, now you see only the brightest. Whereas you could previously make out the shapes of trees, now only artificial light cuts through the darkness. The air has become translucent.

Then fog rolls through. You can no longer see the man made lights off in the distance. The atmosphere is now opaque.

Flat mirrors do not distort the image of the person looking into them. Thus, people grooming themselves will see themselves as they actually are, and get a better sense of how they appear to others.

If we use fossil fuels we can't conserve them, but we should try to use them efficiently, as they can't be replaced and will eventually be used up. Thus drive a 2 litre car instead of a 4 litre or more, 2 litres will take you fast enough. A 6 litre car is just grotesque and totally unnecessary.

In terms of renewable resources, we should aim at replacing what is used up, thus growing more wood to replace what is logged out. In some areas this policy is followed but there are many places where it isn't, and the environment suffers.

There's no proof that nothing can travel faster than the speed of light, but according to Einstein's theory of relativity as an object moves more quickly it also gains mass. Accordingly accelerating an object up to the speed of light would require infinite energy because it gets harder and harder to push the faster it goes.

Light intensity affects voltage because the higher the intensity of light, the more volts are produced. It works exactly the same way in the case of: the lower the light intensity the less volts that are produced.

The index of refraction of a substance can be determined mathematically using Snell's Law, which relates the angle of incidence and refraction to the refractive indices of the two substances involved. By measuring the angles of incidence and refraction, the index of refraction can be calculated using the formula n = sin(i) / sin(r), where n is the refractive index, i is the angle of incidence, and r is the angle of refraction.

In a vacuum............... Light travels 299,792.458 km per second In one minute light travels 17,987,547.48 km. In one hour light travels 1,079,252,849 km. In one year roughly 9.5 x 10*12

When a ray of light travels from a low index of refraction to a high index of refraction, it bends towards the normal line. This bending of light is known as refraction. The change in speed of light causes the light ray to change direction at the boundary between the two materials.

Light reflects off a smooth surface like a mirror because the surface is flat and regular, allowing the light waves to bounce off in a predictable manner. When light hits the mirror, it bounces off at the same angle as it strikes the surface, creating a clear and sharp reflection.

Yes, it is possible to slow light. While light does not need a medium through which to travel, it can be slowed when it is shone through various materials. If light is projected through a Bose-Einstein condensate, it slows dramatically to something on the order of tens or hundreds of meters per second.

It is the velocity of light in vacuum, c, that is often given as the velocity of light, and it is this velocity that is usually meant when people are talking about relativity or about physics in general.

When I was in college I conducted an experiment in which we slowed light to a few meters per second, using carbon gas frozen to -433 F so it is possible to slow down light

Blue light is deviated the most when white light is dispersed through a prism, causing it to spread out or refract more than other colors. This is due to blue light having a shorter wavelength and higher frequency compared to the other colors in the visible spectrum.