The distance from which you can hear a human voice depends on various factors, including the environment, background noise, the volume and clarity of the speaker's voice, and atmospheric conditions. In general, the audibility of a human voice decreases as you move farther away from the source due to the dissipation of sound energy.
In a quiet and open outdoor environment with little to no background noise, a human voice can be heard from a considerable distance. Under ideal conditions, you might hear a normal conversation or a shout from around 100 to 300 feet (approximately 30 to 90 meters) away.
However, in noisy or crowded areas, or when there are obstructions like buildings or trees, the effective distance from which you can hear a voice may be much shorter. In indoor settings, such as in a room or a small hall, you can usually hear a person speaking clearly within a range of about 30 to 50 feet (approximately 9 to 15 meters).
Keep in mind that this is a general estimation, and actual distances can vary significantly based on the specific conditions and the individual's ability to project their voice. Additionally, some people, such as performers or trained speakers, may be able to project their voices more effectively, increasing their audibility at greater distances.