Comparing Sound Reception from Different

Distances Under Water to Sound

Reception Above Water

 

Problem Statement:

Do changes in distance affect the amount of sound that is recieved by a person underwater?

 

Method & Materials:

Pasco Scientific CI-6506B sound sensor
Pasco 500 CI-6780 computer data box
Computer
Air horn
Measuring tape and distance indicators
Plastic Ziploc container
Aquarium sealant
Sponge pieces
Weights (2)

Water-proof Case
Assemble waterproof case as seen in photograph. Take plastic container and cut a hole in the side. Make the hole close to the same size as the cord from the sensor. Put the weights in the bottom of the container. This will help to sink the case to the pool bottom. Place sponges over weights and around all sides of the sensor except the receiving end. The sponges will help to hold the sensor in place. Use the aquarium sealant to fill the opening around the cord and to seal off the container's lid.

Method Above Water
Set the sound sensor in its case and the computer data box in one secure location. Measure three distances (10 feet, 20 feet, 30 feet) from the sensor and mark them with a distance indicator (ex. Post-It). At the first indicator, set off air horn. Then repeat this when the air horn is set at the other two distances. Repeat experiment and connect data box to computer to receive information.

Method Under Water
Hold the sound sensor in its case to the side of the pool at two feet. Then repeat the method of the experiment above water.

 

Hypothesis:

We believe that the distance from which the air horn is set off will greatly affect the reception of sound under water. The closer the air horn is to the sensor, the more sound will be received. We think that there will be greater discrepancies between distances under water than between distances above water.

Link to Hypothesis Graphs

Results:

See Display of Results

 

Discussion:

See Analytic Essay

 

Conclusion:

No conclusion could be made from our results. This was obviously caused by some error because our research showed that sound reception under water is actually quite good.

 

 

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