Final answer:
All electromagnetic radiation, including X-rays, ultraviolet light, visible light, and radio waves, travels at the speed of light (3 × 10^8 m/s) in a vacuum, which is the fastest possible speed in the universe. The correct option is E. They all travel at the same speed.
Step-by-step explanation:
The question asks about the speed at which different types of electromagnetic radiation travel. According to physics, all electromagnetic waves, including X-rays, ultraviolet light, visible light, and radio waves, travel at the same speed in a vacuum.
This speed is known as the speed of light and is approximately 300,000 kilometers per second, or 3 × 108 meters per second. Thus, the correct answer to which type of electromagnetic radiation travels fastest is E. They all travel at the same speed.