Question

part a which of these is not an example of a mechanical wave? a sound wave b ocean wave c radio wave d compression wave part b 1. a vibration of an electric charge. 2. transmits energy from the sun to earth 3. a wave which has both an electric and a magnetic component 4. the speed of this wave decreases as the medium becomes denser. what type of wave is being described by the statements above?

Explanation:

For Part A, mechanical waves require a medium to travel through. Sound waves travel through air or other media, ocean waves through water, and compression waves through solids, liquids or gases. Radio waves are electromagnetic waves and can travel through a vacuum, so they are not mechanical waves.
For Part B, electromagnetic waves are produced by the vibration of electric charges, can transmit energy like the Sun - Earth energy transfer, have electric and magnetic components, and their speed generally decreases in a denser medium.

Answer:

Part A: C. radio wave
Part B: Electromagnetic wave