How do radio waves propagate away from the source?

How do radio waves propagate away from the source?

• A. In a curved path following magnetic fields.
• B. In a single direction only.
• C. In a straight line in all directions at once.
• D. They travel randomly.

Answer: (C)

Radio waves are electromagnetic waves that move away from the source in straight lines, expanding outward in all directions. In free space they form expanding wavefronts (like spheres) and travel at the speed of light. The path isn’t curved by magnetic fields in empty space, and the waves aren’t emitted in just one fixed direction or in a random zigzag. Real antennas can shape the pattern so more energy goes in certain directions, but the basic propagation from the source is outward in all directions, along straight paths until they encounter anything that reflects, refracts, or absorbs them.