At Every Instant the Ratio of the Magnitude of the Electric

question 21

Multiple Choice

At every instant the ratio of the magnitude of the electric to the magnetic field in an electromagnetic wave in vacuum is equal to

• A) the speed of radio waves.
• B) the speed of light.
• C) the speed of gamma rays.
• D) all of the above.
• E) only (a) and (b) above.

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