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.

What best describes the difference between the

second sound wave and the first?

The second sound wave reflects off the walls of the

room, so Nina is able to hear the sound.

O The second sound wave travels faster to Nina, so

less energy is dissipated through the air.

O The air molecules in the compressions of the

second wave are more dense, so the sound is

louder

The air molecules in the second wave are spaced

evenly, so a high-frequency wave is produced.

The air molecules in the compressions of the second wave are more dense, so the sound is louder.

Explanation:

In a closed room, Noah and Nina are sitting 15 m apart.

As Noah  says the same sentence twice, Nina  does not hear the sound the first time but she does hear the  sentence the second time.

This happens as the air molecules in the compressions of the second wave are more dense. As a result, the sound is louder.

The correct option is ''The air molecules in the compressions of the second wave are more dense, so the sound is louder''

C. The air molecules in the compressions of the second wave are more dense, so the sound is louder.

Explanation:

I can confirm that the answer to your question is C.

it is called kinetic energy

vapour or gas assuming atmospheriv pressure