Two people cannot hear each other on the surface of the Moon because there is no atmosphere on the Moon. Sound waves require a medium, such as air or water, to travel and be heard. The Moon’s lack of atmosphere means there is no medium for sound to propagate through. Therefore, sound cannot travel from one person to another, resulting in them being unable to hear each other.
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Two people cannot hear each other on the surface of the Moon primarily because [B] there is no atmosphere on the Moon. Sound waves propagate through a medium, such as air, where molecules carry the vibrations from a sound source to a listener’s ears. On the Moon, the vacuum of space extends to its surface, devoid of any significant atmosphere or medium that could transmit sound.
While special types of space suits (option [C]) are indeed worn on the Moon, they are primarily for providing life support and protection against the harsh lunar environment, not for transmitting sound. The lack of atmosphere also means that sound waves cannot travel, making communication via sound impossible without the aid of electronic devices or radio communication.
Thus, the absence of an atmosphere on the Moon is the key reason why sound cannot travel and be heard between two people on its surface.