How fast do all members of the electromagnetic spectrum travel in a vacuum?

All members of the electromagnetic spectrum, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays, travel at the same speed in a vacuum. This speed is known as the speed of light, which is approximately 3 x 10^8 meters per second.

This speed is a fundamental constant of nature, denoted by the letter "c." It represents the upper limit on the speed at which information and matter can be transmitted through space. In a vacuum, there are no obstacles or medium to impede the propagation of electromagnetic waves, allowing them to travel at this constant speed.

Understanding this concept is essential in various areas of physics, including optics, telecommunications, and astrophysics, where the speed of light plays a critical role in calculations and theoretical frameworks.