Place this clip after you show the question and before you show the solution, then follow the reveal with the Bell Ding Sound Effect for a correct answer or a Dun Dun Dun cue when the result surprises the class.
O tym dźwięku
This thirty second clip is built for the prepare the answer moment, linked in its upload note to entering a question in Vietnamese. It creates a tense, focused feeling, like the pause while someone thinks, checks their work, and gets ready to respond before the answer is revealed to everyone watching.