Top best answers to the question «Why does light travel through a vacuum»
How do we know that light can travel through a vacuum?
- Answer 1: There are at least two ways that we know light can travel through a vacuum. The first is by observation of the Sun and other stars. Astronauts have measured the pressure in outer space and found that there is a very good vacuum, much better in fact than that which we can easily make on earth.
10 other answers
Why can light travel in a vacuum? Light is an electromagnetic wave that does not require a medium for transmission. Photons in the light have the property of particle-wave duality. This means they can behave as both particles and waves. Because of this light does not require a medium for propagation. They can travel through a vacuum.
Why does all light travel at the same speed in a vacuum? Through the vacuum of space, no matter what their energy is, they always travel at the speed of light. It doesn’t matter how quickly you chase after or run towards light, either; that speed you view it traveling at will always be the same.
Electric and magnetic fields can exist in a vacuum. When an electric field changes, it creates a changing magnetic field, and vice versa. Oscillations between those fields travel at the speed of light through the vacuum. That's the classical view, which does not involve photons.
In contrast, light waves can travel through a vacuum, and do not require a medium. In empty space, the wave does not dissipate (grow smaller) no matter how far it travels, because the wave is not interacting with anything else. As a wave travels from a source, it propagates outward in all directions.
Darrenmackenz said: I think I understand the basics that, light as it travels through a vacuum oscillates between a magnetic field and a electric field at 90 degrees to each other. Thanks. I don't know if it's a misunderstanding or a grammatical error, light doesn't travel between a magnetic field and electric field.
Why is the speed of light faster in a vacuum? “Nothing can travel faster than the speed of light in a vacuum.” “Light in a vacuum always travels at the same speed.” Those additional three words in a vacuum are very important. Light traveling through anything other than a perfect vacuum will scatter off off whatever particles exist, as illustrated below.
Unlike the wave in the rope, these waves actually travel away from us in all directions. It turns out that in a vacuum, for example in outer space, these waves travel at exactly the speed of light! It doesn't matter how rapidly the fields wiggle back and forth, they will always travel at the same speed.
The direction of vibration in the waves is at 90° to the direction that the light travels. Light travels in straight lines, so if you have to represent a ray of light in a drawing, always use a...
Therefore, the chemical composition of a piece of glass determines the speed at which light travels through it. For example, the speed of light in common window and bottle glass is usually about two-thirds the speed of light in a vacuum. The speed of light in flint glass, which is doped with lead oxide (P b O), potassium oxide (K 2 O) or barium
The reason you can see each object is that light has traveled a great distance through a vacuum to your eyeball. There have also been experiments on earth that require light to pass through a man made vacuum. Scientist actually use the speed and properties of light traveling through a vacuum as a standard.