Iwill mark which statement correctly compares radio waves and microwaves? a) radio waves have a higher frequency than microwaves. b) radio waves have shorter wavelengths than microwaves. c) only radio waves are used in communication. d) radio waves have lower radiant energy than microwaves.

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.