Question

Sound is a mechanical wave; therefore, it __________.

A.) must travel through a medium.
B.) cannot travel through a medium.
C.) can travel through the vacuum of space.
D.) can travel only through air.

Answer 1

A mechanical wave such as sound needs a medium to travel through. This is why they say that in space, no one can hear you scream (because space is a vacuum and no medium exists). On the contrary, light can exist in wave or particle form. This is why we have the ability to see beyond the realms of the Earth.

Answer 2

The answer is A. Must travel trought a medium.

Step-by-step explanation:

The transmission of sound depends on the existence of a material medium (solid, liquid, air particles) where the vibration of the molecules are perceived as a sound wave, which are converted into mechanical waves in the human ear, to be later perceived by the brain.