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T3B11
What is the approximate velocity of a radio wave in free space?
Pick an answer to check it.
Answer: B. 300,000,000 meters per second
Radio waves in free space travel about 300,000,000 meters per second, which is the speed of light. That's where the 300 in the wavelength formula comes from. The miles-per-hour choices use the wrong unit.
Tip: 300 million meters per second; that's why wavelength = 300 / MHz.