Technician exam question T3B11
Subelement T3, RADIO WAVE PROPAGATION· Group T3B
What is the approximate velocity of a radio wave in free space?
- A.150,000,000 meters per second
- B.300,000,000 meters per second (correct answer)
- C.300,000,000 miles per hour
- D.150,000,000 miles per hour
WhyA radio wave's approximate velocity in free space is 300,000,000 meters per second. The speed of light, and therefore of any radio wave in free space, is approximately 300,000,000 meters per second, answer B. 150,000,000 meters per second (A) is off by half, and the mixed-unit figures in miles per hour (C, D) don't correctly express this speed, roughly 300,000,000 meters per second converts to a much larger number of miles per hour than either option states.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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