Noah and Nina are 15 m apart in a closed room. Noah says the same sentence twice. The first time, Nina does not hear the sound, but she does hear the sentence the second time.
Answer
A
The second sound wave reflects off the walls of the room, so Nina is able to hear the sound.
B
The second sound wave travels faster to Nina, so less energy is dissipated through the air.
C
The air molecules in the compressions of the second wave are more dense, so the sound is louder.
D
The air molecules in the second wave are spaced evenly, so a high-frequency wave is produced.