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Speed of light is max. in vaccum and slower in air.
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∙ 13y ago
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What might cause the speed of light to vary?
The speed of light varies depending on what kind of material it's traveling through. It's fastest when in vacuum, and it's different, and slower, in air, water, alcohol, oil, glass, jello, etc.
What is the ratio of speed of light in a vacuum to the speed of sound in air?
In a rough, round figure? 930,000 to 1. Sound travels roughly 1/5 of a mile per second in air. Light travels 186,000 miles per second in a vacuum. In five seconds sound travels one mile. In five seconds, light travels 930,000 miles in a vacuum.
Why is light speed always constant?
A great question. First--It isn't always constant. Light can travel slower than "c" ("the speed of light"). In a perfect vacuum light travels at "c". It's slower in glass, air, water, etc., light can even stop! But "c" is the upper speed limit. Second--Not only light but ANY disturbance in the universe has a speed limit of "c". Even the influence of gravity travels at the speed of light. Third--Einstein didn't just wake up one day with a good idea. The constancy of the speed of light (and relativity in general) explained many curious observations that had been made, and solved many physics problems. Fourth--There have been competing theories that allow a variable "c" but all the experiments indicate that it is indeed a constant value.
What is meant by optical density equals 1?
It means that the speed of light in that medium is the same as in vacuum. This is ALMOST the case for stuff like "air". If you measure closely enough, it is only true for vacuum, all other materials have an optical density > 1.
The speed of light and the speed of sound?
The speed of air at 20 degrees Celsius is 343 meters per second. The speed of light is 299 792 458 meters per second.
How does light change speed from glass to air?
Light changes speed when it moves from glass to air due to the difference in optical density between the two mediums. In glass, light travels slower due to the higher density, resulting in refraction as it enters the less dense air. This change in speed causes the light to bend and change direction.
In which medium is the speed of light a maximum?
The speed of light is a maximum in a vacuum. In other media, such as air or water, the speed of light is slower due to interactions with the medium's particles.
Is the speed of sound equal to an electromagnetic wave?
No, speed of sound in air is much slower than the speed of light in vacuum.
Which factors affect the velocity of light?
The velocity of light is affected by the medium it travels through. It travels fastest in a vacuum and slower in materials like air, water, or glass. It is also influenced by the frequency and wavelength of the light.
Is light slower in air or water or a vacuum and Why?
Light travels fastest in a vacuum because there are no particles to interact with and slow it down. It travels slower in air and even slower in water due to the presence of molecules that can scatter and absorb light, causing it to travel at a reduced speed.
Why light move slower in air than vacuum?
Light moves slower in air than in a vacuum because air molecules and atoms can interact with the electromagnetic waves of light, causing them to scatter and slow down. In a vacuum, there are no particles to interact with, so light can move through it at its maximum speed of approximately 299,792,458 meters per second.
Does light travel faster underwater than in air?
As compared to what? Compared to air, or to a vacuum, light travels quite a bit slower in water.As compared to what? Compared to air, or to a vacuum, light travels quite a bit slower in water.As compared to what? Compared to air, or to a vacuum, light travels quite a bit slower in water.As compared to what? Compared to air, or to a vacuum, light travels quite a bit slower in water.
Through which does light travel best?
Speed of light is fastest through vacuum. Although it is only about 0.001 times slower in air.
Compare and contrast the speed in water and in the glass?
The speed of light in water is slower than in a vacuum. This is due to the higher refractive index of water compared to air, causing light to bend more in water. In a glass, the speed of light is also slower compared to a vacuum, though the exact speed will depend on the composition of the glass.
Is speed of light uniform or not?
The speed of light in a vacuum is constant everywhere. The speed of light in a particular medium depends on what the medium is. It moves slower in air than in a vacuum, and slower in water than in air.
Speed of light travel?
Very nearly 300,000,000 meters per second, in vacuum. A bit slower, but not much, in air.
Does light speed up or slow down when it leaves water into the air?
The speed of light in air is almost but not quite the same as its speed in vacuum,whereas its speed in water is about 25% less.So when light passes from air into water, its speed drops by about 25% .
