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Does the speed of an electromagnetic wave in free space depend on its wavelength?

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Question

Does the speed of an electromagnetic wave in free space depend on its wavelength?

Options

  • Only for visible light.

  • Yes; the speed increases with wavelength.

  • Yes; the speed decreases with wavelength.

  • No; the speed is independent of wavelength.

MCQ
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Solution

The speed of electromagnetic waves in free space is independent of wavelength. All electromagnetic waves travel at the same speed in a vacuum.

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