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Which of the following is true regarding the speed of light?

  1. The speed of light varies in space with the wavelength

  2. The speed of light increases when it travels through matter

  3. It is constant for all electromagnetic waves traveling in a vacuum

  4. Its value is 200000 km/hr

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Lelia Lubowitz
Lelia LubowitzLv2
2 Oct 2019
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