Which of the following statements is true concerning mechanical waves and electromagnetic waves?

A
Both electromagnetic waves and mechanical waves require a medium to travel through.

B
Mechanical waves require a medium to travel through; electromagnetic waves do not.

C
Electromagnetic waves require a medium to travel through; mechanical waves do not.

D
Neither electromagnetic waves nor mechanical waves require a medium to travel through.

B

Explanation:

Electromagnetic spectrum includes visible light which we see all the time reflecting off objects to give them colours, mechanical waves like sound require something to move in, its the reason why people say you can't scream in space because space is a giant vacuum. No not the kind you use to clean up the mess you made from breakfast. The kind that has no air. So sound can be heard on earth as it is not a vacuum, air moves freely and transfers sounds vibrations all around you to be absorbed by walls and other stuff in comes in contact with.

Extra information:

Sound travels further in water because the molecules are closer together meaning that transferring the energy is easier. This is how Blue wales can communicate from hundreds of miles away.

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.