Q: How do you calculate speed of light in a vacuum?

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The speed of light is not limited in a vacuum - the speed of light is fastest in a vacuum. But that is what Einstein called the "Cosmic Speed Limit" - nothing can move faster than the speed of light in a vacuum, or even quite asfast.

About 2/3 its speed in a vacuum.

The speed of light is 186,000 miles per second in a vacuum.

In a vacuum the speed of red and blue light are the same as all light, 300,000,000m/s. Their frequency and wavelength will be different but the speed remains the same.

The index of refraction.

Related questions

Speed of light in water = speed of light in vacuum/refractive index of water

The speed of light in any medium isspeed of light in vacuum/refractive index of that medium.

The formula used to calculate the speed of light is c = fλ, where c is the speed of light, f is the frequency of the light wave, and λ is the wavelength of the light wave. The speed of light in a vacuum is approximately 299,792 kilometers per second.

Index of refraction can be calculated using the formula n = c/v, where n is the index of refraction, c is the speed of light in a vacuum, and v is the speed of light in the medium. Just divide the speed of light in a vacuum by the speed of light in the medium to find the index of refraction for that medium.

The speed of light is not limited in a vacuum - the speed of light is fastest in a vacuum. But that is what Einstein called the "Cosmic Speed Limit" - nothing can move faster than the speed of light in a vacuum, or even quite asfast.

Assuming the speed of light in air is already known (it is close to the speed of light in a vacuum), you might check how the light refracts when it changes from air to water (at what angle), and then use Snell's Law.

No, not as long as the light stays in vacuum.No, it does not. That is where it has its maximum speed.

The speed of light IN A VACUUM is always the same. In substances other than the vacuum, the speed of light is usually slower than in a vacuum.

Frequency and wavelength are inversely proportional in a vacuum, following the equation speed = frequency x wavelength. Since the speed of light in a vacuum is constant, knowing the wavelength allows you to determine the frequency of an electromagnetic wave.

In vacuum, the speed is 299,792,458 meters per second.

The speed of light in water is about 75% of the speed of light in a vacuum. This is due to the higher refractive index of water, which slows down the speed of light as it passes through the medium.

About 2/3 its speed in a vacuum.