A It is constant for all electromagnetic waves traveling in a vacuum.
B The speed in space varies with wavelength.
C Its value is 300,000 km/hr.
D The speed of light increases when it travels through matter
2 Answers
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A) It is constant for all electromagnetic waves traveling in a vacuum.
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A
It's 299,792,458 m/s in a vacuum, slows down through matter and is independent of wavelength.