What is the approximate velocity of a radio wave in free space?

Radio waves are a form of electromagnetic radiation. In a vacuum or free space, all electromagnetic waves, including light and radio waves, travel at the universal speed of light. The speed of light in free space is approximately 300,000,000 meters per second (often written in scientific notation as 3 x 10^8 m/s). This value is a foundational constant in radio theory, frequently used in formulas to calculate the wavelength of a specific frequency. Be very careful to read the units provided in the multiple-choice options. Exam distractors deliberately use incorrect units like 'miles per hour' to trick students who are rushing and only looking at the number.