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AP Physics 2
14.6 Wave Interference and Standing Waves
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AdvancedMCQConceptual14.9k
Bottle setups for blowing across the top (Setup 1) and tapping the side (Setup 2).
Bottle setups for blowing across the top (Setup 1) and tapping the side (Setup 2).
A student performs an experiment with a cylindrical glass bottle partially filled with water. When the student blows air gently across the open top of the bottle, adding more water increases the pitch of the fundamental sound produced. However, when the student gently taps the side of the glass bottle with a light rod, adding more water decreases the pitch of the fundamental sound produced. Which of the following best explains why adding water causes opposite shifts in pitch for these two actions?

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