Question

Which statement is true?

A) All waves travel at the same speed through any medium.
B) All waves travel at the same speed if no medium is present.
C) Electromagnetic waves require a medium, but mechanical waves do not.
D) Mechanical waves require a medium, but electromagnetic waves do not.

Answer 1

D) Mechanical waves require a medium, but electromagnetic waves do not.

Explanation:

Answer 2

the answer is D, mechanical waves have to travel through stuff while electromagnetic waves are just excited energy which can exist by itself