Rays which need a medium to travel.
mechanical
No, sun rays are not mechanical waves. Sun rays are a form of electromagnetic waves that propagate through space as a result of electromagnetic interactions. Mechanical waves, on the other hand, require a medium (such as air or water) to propagate.
electrical
Electromagnetic waves, if it was mechanical, something would literally have to make them!
Electromagnetic waves
No, X-rays are a form of electromagnetic wave, not a mechanical wave. Mechanical waves require a medium (such as air or water) to propagate, while electromagnetic waves can travel through a vacuum.
Sun rays are electromagnetic waves, specifically in the visible light range. They travel in a wave form and do not require a medium to propagate, distinguishing them from mechanical waves like sound waves that do need a medium.
Electromagnetic waves
Sound. Heat, light, radar & x-rays are electromagnetic.
Astronomers use the EM spectrum, Physicists speculate about it, yet the practical study of it falls to the Mechanical Engineers: your answer = mechanical engineering.
X-rays and gamma rays have the highest energy, highest frequency, and shortest wavelengths in the electromagnetic spectrum. Sound waves, on the other hand, are mechanical waves that require a medium to propagate and are not part of the electromagnetic spectrum.
Alfred Kemper has written: 'Wear measurements by means of [gamma]-X-fluorescence' -- subject(s): Gamma rays, Industrial applications, Measurement, Mechanical wear, X-rays 'Chemie'