Electromagnetic and mechanical waves both transfer energy. How is an electromagnetic wave different from a mechanical wave? Question 4 options: a.An electromagnetic wave has frequency, and a mechanical wave does not. b.An electromagnetic wave is made of atoms, and a mechanical wave is not. c.An electromagnetic wave can travel in a vacuum, and a mechanical wave cannot. d.Electromagnetic waves have frequencies that never change, and mechanical wave frequencies change.
c. An electromagnetic wave can travel in a vacuum, and a mechanical wave cannot.