Spanish · Pronunciation Guide
keh, one syllable — the u is silent and the accent flags it as a question word.
One syllable, so the accent cannot be assigning stress within the word. It marks "qué" as interrogative or exclamatory, distinguishing it from the unaccented "que" that links clauses. In a sentence, though, the accented one really does carry emphasis, so the mark is a fair signal of how it sounds in the flow.
Listen: qué
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¿Qué es esto?
What is this?
Listen: ¿Qué es esto?
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"¿Qué es esto?" runs three vowel-adjacent words together — keh-e-SES-to in natural speech — with the s of "es" linking into "esto". The inverted question mark at the start tells your voice to prepare a rising contour before the first word, something English handles with word order instead.
English voices the u in "quest" and "queen", so readers voice it here too and produce "kweh". In Spanish the u after q is silent every time. The other half of the problem is accentuation in writing: "que" and "qué" sound the same, so learners write whichever comes to hand, and "dice que" versus "dice qué" is the difference between he says that and he says what.