Experts please solve this one
CHAPTER NAME WAVE MOTION AND SOUND
Thanks

Dear Student,
Sound is a wave which requires a material medium to travel. as moon doesn't have any atmosphere, sound cannot travel and hence two astronauts can't talk the way they use to talk on earth.
If they want to talk with each other on the surface of the moon they can do so within the spacecraft where atmospheric pressure is maintained.
They can use a string and cup arrangement to talk. The cups are installed within their space suit where atmospheric pressure is maintained while the string connects them from one another. 
The string will act as the medium for the sound waves to travel. From the cups the sound can be transferred to the ear through air.

Regards
 

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