The way a human voice would occur on other planets depends on several factors, including the composition of the planet's atmosphere and its ability to transmit sound.
For sound to propagate, it requires a medium such as air, water, or solids to transmit the mechanical vibrations that we perceive as sound waves. Since we are discussing other planets, let's consider the two most likely scenarios:
Earth-Like Atmosphere: If a planet has an atmosphere similar in composition and density to Earth's, sound would likely propagate in a similar way. A human voice on such a planet would travel as sound waves through the air, allowing it to be heard by anyone present in the vicinity. However, it's important to note that the conditions for sound transmission might still be influenced by other factors, such as temperature or pressure.
Different Atmosphere: If a planet has a significantly different atmosphere than Earth's, the propagation of sound could be altered. For example, if the planet has a very thin atmosphere or no atmosphere at all, like the Moon, sound waves would not be able to travel as they do on Earth. In such cases, sound would not propagate, and a human voice would not be heard in the same way we are accustomed to on Earth.
It's also worth mentioning that the perception of sound itself might be different on other planets. Factors such as atmospheric composition and density could affect the speed of sound, the way it resonates, or the frequencies that can be transmitted. As a result, a human voice may sound different or be perceived differently by inhabitants of other planets, assuming they have the means to perceive sound in the first place.
Keep in mind that our understanding of other planetary environments is limited, and future scientific discoveries may provide more insights into the nature of sound propagation on other celestial bodies.