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Laboratory 4

# Position of the reflector can be measured because of

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Unformatted text preview: . linear regression of the data plotted in figure 1. From here we can extrapolate the slope along with its uncertainty. Analysis will be done in the later part. Standing Waves For this experiment, we generated standing waves. Nodes occur where amplitude is zero, spacing between them is half a wavelength spacing. In order to creating standing waves, the superposition of oppositely propagating and equal amplitude waves are required. Therefore, a movable reflector is needed. Position of the reflector can be measured because of the potentiometer attached to one of this wheels. However, we have to calibrate the potentiometer, converting voltage to position. Nodes and antinodes in the microphone signal can be expressed as a function of the reflector’s position, and the wavelength can also be determined. This calibration is good as long as the voltage input stays the same. In this lab, we used a voltage input of 2 V. Next, the reflector was incrementally and the voltage output was measured. distance vs voltage 0.35 0.3 0.25 0.2 distance (m) 0.15 y = - 1.4268x - 0.0599 R² = 0.99875 0.1 0.05 0...
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