you'd have to study acoustics to truly understand this question. Ive studied acoustics as part of my degree, but you'll need an engineer or better yet an acousitic engineer to give you an exact answer.
however, going by what you've given us, no you wont hear it.
ive built ballrooms, so i know a little about them. ballrooms are designed to absorb sound so that other people in the hotel are not affected from sound and vibration. What you will see in a ballroom is soft furnishings ( ie. carpet, soft furniture, plasterboard walls, sound insulating ceilings, canvas paintings etc) that will absorb the sound vibrations from music or peoples voices.
Obviously soft furnishings are generally excellent absorbers of sound as opposed to hard surfaces like tiles and concrete walls. The more things you put in a room, the less echo you will generally have. The last thing you want in a ballroom would be an echo because of the music. any musician could tell you this anyways.
in short, even if it was just you and your friend in the room it would be difficult to hear. but that would depend on the size of the room as well as the distance away from him and the materials used to construct the ballroom.
with all the other variables it would be almost impossible i'd say.
why do you need to hear the beep anyways? is it some sort of wingman signal?
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