The primary difference between mechanical waves and electromagnetic waves is that mechanical waves need a to travel through. *
4 points
particle
medium
magnet
electrode

Medium

Explanation:

Electromagnetic waves (light, electricity) can travel through space, which has no medium (air), while mechanical waves cannot. The main medium for mechanical waves is air, and without the medium, the wave cannot travel. This is why you cannot hear sound in space.

The roaring spacecraft in Star Wars is false.

there are no correct statementd on the list of choices you provided.

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.