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Plastic tube centimeter scale water reservoir air

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PlasticTubeCentimeterScaleWaterReservoirAirRubberHoseWaterSupportRodFigure 2Resonance-Tube Apparatus
Experiment VWS-497There are certain lengths of the air column (in relation to) for which the vibrations of the airmolecules at the antinodes are especially large.This condition of the air columns is known as resonance.At resonance the energy is removed more rapidly from the tuning fork and the sound becomes louder.Figures 3 a, b, and c show the three resonance conditions possible with your apparatus.The nodes ofdisplacement are marked as "N" and the antinodes are marked as "A".Note that in each resonant casethere is a node at the bottom of the air column and an antinode at the open end of the tube.Yourapparatus can be adjusted for the three resonant conditions by listening for increases in the loudness ofthe sound of the tuning fork.The wavelength can be calculated from the length of the air column atresonance.Finally, the speed of sound in air can be calculated using equation (2).ANANANANNANAl4l=34l=54=abcFigure 3Resonance in the Air ColumnApparatusResonance-tube apparatusTuning fork (512 Hz)Tuning-fork activatorBeaker (400 ml)StethoscopeCentimeter scaleVernier Caliper
Experiment VWS-498ProcedureCautionary Notes:a.Water is sometimes spilled accidentally during this experimentIt is advisable tokeep books and other personal property offthe table where you are using theresonance-tube apparatus.b.A stethoscope is provided if you have difficulty hearing the sound from your ownresonance tube.Its ear pieces have been sterilized with alcohol.No more thanlab partner should use the stethoscope because of the danger of spreading an earinfection.1.Measure and record the room temperature to the nearest tenth of a degree Celsius.Read thefrequency engraved on the tuning fork and record it on the data sheet.Measure the inside diameter ofthe plastic resonance tube with a vernier caliper and record it on the data sheet.2.Set the reservoir cup of the apparatus as high as it will go on the metal rod (i.e., until it bumps intothe bracket supporting the top of the plastic tube).Be sure that the rubber tubing is tightly attached atone end to the reservoir and at the other end to the bottom of the plastic tube.Pour water from abeaker into the reservoir until the water level in the plastic tube rises to a point about 14 cm belowthe top of the tube.3.Strike the tuning fork on the rubber activator.Hold the tuning fork over the plastic tube with oneprong directly over the other prong.4.Slowly lower the water level in the plastic tube by lowering the water reservoir.Adjust the waterlevel until the sound of the tuning fork is reinforced by resonance in the column of air above thewater.It may be necessary to reactivate the tuning fork several times while searching for the waterlevel at which the sound of the tuning fork is loudest.You will need to read the water level while itis changing at the instant the sound is loudest.Read the scale next to the plastic tube at this waterlevel to the nearest .02 cm.

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Term
Spring
Professor
dziembowski
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