Question

when you shout inside an Empty hall you hear your own sound after a short time why does it happen

Answer 1

An empty room is unable to convert echoes from the space, while a room filled with furnishings can better control the level of echo. ... Because in a furnished room will absorb the sound waves,hence there won't be any echo.But in a an empty room reflect the sound.Therefore there will be echo.Hence we hear sound louder.

Answer 2

because in empty there is no any sound absorvation materials.
so the sound easily get reflected from the walls of the room. and hence we can hear our own sound within the interval of 0. 1 sec.

And for getting an perfect echo the distance between the walls and us must be atleast 17 m.

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