Question

Which is true of a mechanical wave?

A) It must have a medium.

B) It must travel in empty space.

C) Both sound and light are examples.

D) It can travel in a vacuum.

Answer 1

A) It must have a medium.

Answer 2

A) True

Mechanical waves need a medium to travel.

B) False.

Mechanical waves need a medium to travel. So they can not travel in empty space.

C) False

Sound is a mechanical wave since it needs a medium to travel. light wave is electromagnetic wave and it can travel in empty space too.

D) False

Mechanical waves need a medium to travel. So they can not travel in empty space.