Which rays need a medium to travel?

Explanation

Option A: X-rays are a form of electromagnetic radiation. Unlike beta particles, X-rays do not require a medium to travel. They can propagate through a vacuum as well as through various materials, including solids, liquids, and gasses.Option B: Beta rays, or beta particles, are high-energy electrons or positrons. They have mass and charge and interact with matter as they travel through it. Beta particles are typically emitted during radioactive decay processes. They require a medium, such as air or a solid material, to propagate.Option C: Gamma rays are a type of electromagnetic radiation, similar to X-rays. They are highly energetic and have no mass or charge. Gamma rays, like X-rays, do not require a medium to travel. They can pass through a vacuum and various materials.Option D: No radiation needs a medium to travel: This option is incorrect. Both beta rays and gamma rays require a medium to propagate, while X-rays and other forms of electromagnetic radiation can travel through a vacuum.