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In vacuum, the speed of an electromagnetic wave A) depends upon itsfrequency. B) depends upon its wavelength. C) depends upon the strength of its electric andmagnetic fields. D) is a universal constant.
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In vacuum, the speed of an electromagnetic wave

A) depends upon itsfrequency.
B) depends upon its wavelength.
C) depends upon the strength of its electric andmagnetic fields.
D) is a universal constant.

User Kyrisu
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1 Answer

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D.is a universal constant
The speed of any electromagnetic wave in a vacuum is 3.0*10^8 ms⁻¹
User Rye
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