Investigating Refraction of Sound with a Gas Lens

Ian Fulton

Sound!• Transverse Wave

RefractionInsert textx

Experiment #1Aim:

To determine how the wavelength (frequency) of sound affects its refraction through a Carbon Dioxide balloon.

Hypothesis:

MethodA consistent setup was used to gather all the results which were

collected by a microphone connected to a computer-generated Oscilloscope.

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Independent and Dependent variables

Balloon

MicrophoneSpeaker frequency

• The Amplitude difference was taken for each position.

Control Variables• Size of the balloon

• The room temperature

• Amplitude of the sound

• Parameters of the setup

Results

Results

Results

Discussion• The hypothesis was at first glance supported by the results

• The higher frequencies created a higher amplitude than the lower ones when refracted with the CO2 balloon.

The focal length was inside the balloon

The loudest point is right next to the

balloon.

Discussion

Discussion• The Carbon Dioxide balloon was a biconvex lens and

refracted the sound inwards.

• Improvements…

Experiment #2Aim:

To determine how the refraction of sound with a Carbon Dioxide balloon is affected by the size of the balloon.

Hypothesis:

• It was determined from the results that the size had very little affect upon the level of refraction, the shape was more relevant.

Conclusion• In Summary

• The hypothesis for the first experiment was not supported but it was determined to be the opposite

• The hypothesis for the second experiment was not supported at all

Questions!