Question

every sound you hear travelled through the air in a wave before entering your ear. and every time you turn on a lamp, you send light waves shooting off. all waves move energy, in fact, a wave is the movement of energy. some waves can only travel through matter. for example, sound waves need matter in order to travel. they can travel through solid, liquid or gas. other waves, like light waves, dont need matter to travel. they can journey through empty space. thats how light from the sun reaches us. it travels through empty space. which of the following is true about all waves? a they enter your body through your ear. b they need matter to travel through. c they represent the movement of energy. d they cannot travel through empty space.

Explanation:

The text clearly states that all waves move energy and a wave is the movement of energy. Sound waves enter through the ear but not all waves do. Some waves (like light) don't need matter to travel and can travel through empty - space.

Answer:

C. They represent the movement of energy.