In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

Question: If Mona shines a light through both wool and cotton and determines that cotton is more dense then wool, which material will the light move faster through? 
 Answer: wool
The more dense the medium, the slower the light moves.

Question: Milo is trying to heat his room with a space heater. If he turns up the thermostat to a hotter setting, which is happening to the energy the heater is producing? 
 Answer: increasing
Bigger stars produce more energy, so their surfaces are hotter.

Question: If Milo is listening to the radio and he moves to the far end of the room, what happens to the sound waves entering his ear? 
 Answer: they spread out more

The farther the sound waves travel away from the source, the more spread out their energy becomes.