Why two people cannot hear one another in the space
Answers
1 Only if they have communications devices. There's no atmosphere. Sound needs a medium through which to travel.
2 Without radios, and helmeted of course, they could stand face-to-face and scream their lungs out, but neither would hear the other.
3 That's why movies that are aware of this fact and feature astronauts with no radios, like First Men in the Moon, have them touch helmets and establish physical contact.
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The Moon has no tangible atmosphere – at its surface, it is a near vacuum. Sound waves are pressure waves that propagate by vibrating the molecules of a medium, such as air or water. In a vacuum, there is nothing to vibrate, and thus no propagation.
When we speak, we are using our mouths to create vibrations in the air in our mouth. That air passes the vibration to the air just outside our mouth, which passes the vibration to the air next to it, and so on, until it reaches the air in our ears, which pass the vibration to our ear drums.
Electromagnetic waves can travel through the vacuum of space. They don’t need a medium other than space itself. So, astronauts on the Moon’s surface would talk to each other using radio.