Speed Of Light

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Speed of Light

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speed of light (c) : The speed of an electromagnetic wave in free space , 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.

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

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

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