Atypical two-tine tuning fork is barely audible when held vibrating at an arm's length. It is enough, however, to touch its base to a table or, better, to a resonance box and the emitted sound becomes much louder. An inquiring student may pose questions: -Why is a bare tuning fork such a weak emitter of sound? -What is the role of the resonance box? -Where does energy connected with larger intensity of emitted acoustic waves come from?
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