Speed Of Light

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Speed of Light

Subjects > Science (Search for Science)

speed of light (c) : The speed of an electromagnetic wave (Search) in free space (Search), precisely 299,792,458 m/s.

Note 1: The preceding figure is precise because by international agreement the meter is now defined in terms of the speed of light?Create|Search.

Note 2: The speed of an electromagnetic wave (Search), e.g. , light, is equal to the product of the wavelength (Search for wavelength) and the frequency (Search for frequency).

Note 3: In any physical medium (Search for medium), the speed of light is lower than in free space. Since the frequency (Search) is not changed, the wavelength (Search) is also decreased. [After FAA]

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