Question

what is the difference between mechanical wave and electromagnetic wave?

Explanation:

Mechanical waves need a medium to propagate, like sound in air or water waves. Electromagnetic waves can travel in a vacuum, such as light. Mechanical waves are caused by vibrations of matter, while electromagnetic waves are due to changing electric and magnetic fields.

Answer:

Mechanical waves require a medium for propagation and are caused by matter - vibrations. Electromagnetic waves can travel in a vacuum and are due to changing electric and magnetic fields.