Put it immediately after the answer line in your edit, while the on-screen question is still visible. Build tension first with sudden suspense, then let this confirm the result, then follow with kids cheering for a bigger payoff on correct answers in quiz and classroom edits.
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This clip is a very short voice recording, under a second long, of a single word, "right", spoken in a flat, matter-of-fact tone. It lands as dryly satisfying, giving a small moment of agreement, correctness and quiet smugness, like a confirmation that needs no further explanation at all.