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Home Q & A Board Science-Related Homework Help Physics
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12 years ago
There is light speed the amount of time light travels in a year. Light is supposed to be the fastest moving force in our universe, theoretically of course. But does all light travel at the same speed? Can there be variations of light that travel slower or even faster than our standard benchmark? Or can the speed of light be altered?

I ask the same question for sound? Is it possible?
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#1
12 years ago
In vacuum all light travels at the same speed.
In materials, however, different frequencies of light may (and do) travel at different velocities, all lower than the speed in vacuum.

The speed of sound is even easier, because it depends on the elastic properties of the medium the sound is moving through. The more elastic the medium, the greater the speed.
wrote...
#2
12 years ago
Light cannot go faster than around 3 x 10^8 m/s - which is in a vacuum
but it will often be slower when it passes through air, water or glass for instance.
Sound is the opposite - it speeds up when it goes from air into denser materials
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