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What is the velocity of an electromagnetic wave?

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Faraday got very old. His health was declining. He made an educated guess in his young days that light is an electromagnetic wave. Everybody laughed. Faraday couldn't work ahead. Then came Maxwell. read more

The remarkable agreement between this experimentally determined velocity and his theoretical prediction for the velocity of electromagnetic waves immediately lead Maxwell to hypothesize that light is a form of electromagnetic wave. Of course, this hypothesis turned out to be correct. read more

The velocity of an electromagnetic wave in vacuo is a defined universal constant known as c, 299,792,458 m/s. read more

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Source: brocku.ca