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Yes - all light (and in fact, all electromagnetic radiation) travels at the same speed (about 300 000 km/s). Different coloured light is seen as different colours because it has different wavelengths and frequencies.

The speed of light c, the wavelength of light lambda , and its frequency f are related by the following formula:

c = f x lambda

c is a constant - it never changes. This remarkable fact led Einstein to his theory of Special Relativity.

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