Astronauts who are working outside the space shuttle require an audio speaker in their helmets because ________.

PLEASE HELP!!!!!!

A: Space is very noisy, and they cannot hear each other

B: Sound is an electromagnetic wave and does not require a medium to travel through

C: Sound is a mechanical wave and requires a medium to travel through

D: Sound is an electromagnetic wave and has a long wavelength

those are the answer choices

I know its not A.

What have you learned about how sound travels?

I know sound needs to travel through a medium.

So is it C

Astronauts who are working outside the space shuttle require an audio speaker in their helmets because sound cannot travel through the vacuum of space. This means that if they didn't have a speaker system, they wouldn't be able to hear any communication from mission control or fellow astronauts. The speaker allows them to receive important instructions, warnings, or updates while conducting spacewalks or other tasks outside the space shuttle.

To get this answer, you can look up information about the working conditions of astronauts during spacewalks or extravehicular activities (EVAs). There are many reliable sources available, including NASA's official website, where you can find detailed information about the equipment used by astronauts during different phases of a space mission.