Place it immediately after the spoken question and just before the answer appears on screen, so it bridges the request and the result. Follow it with a bell ding when the result lands, or start the scene with an error sound when the first attempt fails.
關於此聲音
This is a very short, bright confirmation chime lasting under half a second, the kind of clean electronic tone that signals a task has gone through. It feels reassuring and tidy, a small lift after speaking a request aloud. It is the sound heard when a Google voice search is accepted.