ON17 P11 Q23 Stationary Waves in Tube of Water | CAIE A Level 9702 Physics

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9702/11/O/N/17: A loudspeaker emits a sound wave into a tube initially full of water. A tap at the bottom of the tube is opened so that water slowly leaves the tube. For some lengths of the air column in the tube, the sound heard is much louder.

The first loud sound is heard when the air column in the tube has length x.
The next time that a loud sound is heard is when the air column in the tube has length y. What is the wavelength of the sound wave from the loudspeaker? #9702w17p11 #ASsuperpositionP1 #ASstationaryWavesP1 #Lv2

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If there was an option "4x", that would also be correct right?

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