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The electromagnetic waves are the radiations of large of wavelength. What are their velocity (i) in vacuum and (ii) in a medium? |
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Answer» The wavelength of electromagnetic wave ranges form `6xx10^-14m` to `6xx10^6m`. These waves travel with the same velocity `(=3xx10^8` `ms^-1)` in vacuum but with different velocities in a medium. In fact, the velocity of an electromagnetic wave is less in a medium than vacuum and a medium provides different values of refractive index to the electromagnetic waves of different wavelengths. |
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