Question

this graph is accurate because... a mechanical waves move faster than electromagnetic waves. b electromagnetic waves cannot travel through a vacuum. c mechanical waves cannot travel through a medium. d electromagnetic waves move faster than mechanical waves.

Explanation:

Electromagnetic waves travel at the speed of light in a vacuum ($3\times10^{8}$ m/s) and are generally much faster than mechanical waves which require a medium to travel through and have lower speeds depending on the medium. Mechanical waves move slower than electromagnetic waves.

Answer:

D. electromagnetic waves move faster than mechanical waves