Two astronauts go the surface of the moon and would speak to each other. Explain how they could achieve this.

Can two astronauts talk on the surface of moon as they do on earth?Why?

Assertion : Two persons on the surface of moon cannot talk to each other. Reason : There is no atmosphere on moon.

Two astronauts who land on the moon cannot talk with each other. What could be the reason for this ? Suggest a method for them to talk each other.

How are rest and motion relative to each other. Explain with an example.