Question
What is the velocity of a radio wave traveling through free space?
Answer Options
- A) Speed of light
- B) Speed of sound
- C) Speed inversely proportional to its wavelength
- D) Speed that increases as the frequency increases
Correct Answer: A
Explanation
A radio wave, being a form of electromagnetic radiation, travels through a vacuum or free space at the speed of light (often represented by the variable c).
The speed is constant, regardless of its frequency or wavelength. The approximate value is 300,000,000 meters per second (T3B11). Only when the wave passes through a dense medium (like the atmosphere or a coaxial cable) does its speed decrease slightly, often described by the velocity factor.
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