What is the speed of light compared to the speed of x-rays?

The speed of light and the speed of X-rays are essentially the same in a vacuum, as both are forms of electromagnetic radiation. In vacuum, all electromagnetic waves travel at the speed of light, which is approximately 299,792 kilometers per second (or about 186,282 miles per second). This uniform speed applies to all frequencies within the electromagnetic spectrum, including visible light and X-rays.

X-rays are a specific type of high-energy electromagnetic radiation, and like all electromagnetic waves, they propagate through a vacuum at the speed of light. Therefore, the correct answer indicates that there is no difference in speed between light and X-rays when in a vacuum.