Which one of following is not an electromagnetic wave? Sound Wave, Infrared Rays, Radio Wave, X-Ray

Electromagnetic waves are waves that consist of oscillating electric and magnetic fields that propagate through space at the speed of light. They include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. Sound waves, on the other hand, are mechanical waves that require a medium (like air, water, or solids) to travel through. They are vibrations that propagate through a medium, transferring energy from one particle to another. This is fundamentally different from the nature of electromagnetic waves, which can propagate through a vacuum.