What is the velocity of all electromagnetic waves in a vacuum?The velocity of electromagnetic waves depends upon their wavelength.The velocity of electromagnetic waves is nearly equal to 3 × 108 m/s.The velocity of electromagnetic waves depends upon their frequency.The velocity of electromagnetic waves depends upon their amplitude.Electromagnetic waves do not propagate forward; hence, their velocity is zero.
Question
What is the velocity of all electromagnetic waves in a vacuum?The velocity of electromagnetic waves depends upon their wavelength.The velocity of electromagnetic waves is nearly equal to 3 × 108 m/s.The velocity of electromagnetic waves depends upon their frequency.The velocity of electromagnetic waves depends upon their amplitude.Electromagnetic waves do not propagate forward; hence, their velocity is zero.
Solution
The velocity of all electromagnetic waves in a vacuum is constant, regardless of their wavelength, frequency, or amplitude. This speed is approximately 3 x 10^8 meters per second, or 300,000 kilometers per second. This is often referred to as the speed of light, as light is an electromagnetic wave. The statement that electromagnetic waves do not propagate forward and hence their velocity is zero is incorrect. They do propagate forward at the speed mentioned above.
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