There are a lot of factors affecting how far away a given voice can be heard in a given situation. Higher pitches are generally more noticeable; ambient noise can prevent the sound of a voice being registered even if it’s physically detected. If you’re outdoors, wind can carry the voice farther if it’s going in the same direction, or stop it from traveling as far if it’s in the opposite direction. It also depends on who the hearer is – some animals have much keener hearing than humans. Indoors, voices will tend to bounce off walls and carry farther than outdoors. All these other things disregarded, I’d imagine that the average person couldn’t reach more than 200 metres, maximum, in an open space.
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