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Technically the speed of light does not vary because of the material, because the speed of light is a constant at around 300,000km/s
Light is a form a energy. It is not an 'example' of matter. Matter only consists of solids, liquids and gases, and plasma.
Mechanics, energy, sound, light, magnetism, electricity, force, motion, momentum, matter (solids, liquids and gases).
Solids because in solids the velocity of sound is not unique, for example a shear wave will travel at a different velocity (higher) than a pure compression wave. As a matter of fact flexural waves do not have a well defined velocity as they are dispersive ... the frequency of the wave changes with displacement. Furthermore in two and three dimensional waves in solids the propagation area changes with distance so that a characteristic impedance cannot be defined and the wavelelength (but not the frequency) change during propagation. Therefore you will need to define the type of wave in solid before you can ask if a faster wave is possible.
Yes
It's mostly to do with density. In simple terms, gases have very low densities compared to solids and liquids, so that their molecules/atoms cause very little scatting of light as it passes through them.
Technically the speed of light does not vary because of the material, because the speed of light is a constant at around 300,000km/s
Light is a form a energy. It is not an 'example' of matter. Matter only consists of solids, liquids and gases, and plasma.
Light generally doesn't travel faster through solids than through gases. Sound does, but not light.
It slows down when travelling through materials whose refractive index (optical density, NOT physical density) is high. Gases generally have low refractive indices but with liquids and solids, there it depends on the substance.
sound and light can travel through sound air solids water liquids light wiers lightbubs extentions etc.
Mechanics, energy, sound, light, magnetism, electricity, force, motion, momentum, matter (solids, liquids and gases).
No, all light is the same no matter if it is artificial or natural. and light is an energy, like heat. light has no mass or volume and you cannot touch it like you can touch solids/liquids/gases.
Gases are lighter than solids and liquids, so light that they can be in our atmosphere. Example, when water evaporates it is light and goes up into our atmosphere where it will condense to form liquid, which is now heavier and more dense and therefore falls
No, compressional waves travel through liquids and gases. Transverse waves pass through solids. You may also be forgetting electromagnetic waves such as light, radio, x-rays, etc that propagate in neither of these ways and can even pass through vacuums.
Please note that there are individual differences, between different liquids, or between different solids. But as a rough guideline, you can expect light to be fastest in the materials that are less dense - and also as a rough guideline, solids are often more dense than liquids, and liquids are almost always more dense than gases. However, there is a lot of overlap between solids and liquids - check the Wikipedia article "List of refractive indices" for some examples.