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No, an X-ray is not a mechanical wave. An X-ray is an electromagnetic wave. However, in polar molecules, an X-ray can cause the molecule to vibrate rapidly, just like a microwave oven can.
X-Rays vs Gamma Rays. Electromagnetic spectrum is a very useful concept used in the study of physics. X-rays are a type of electromagnetic rays, which are used for medical purposes, and gamma rays are widely used in observational astronomy. Both of these electromagnetic rays are high-energy electromagnetic rays.