A class uses a shallow ripple tank or a calibrated wave simulation to investigate a wave model. Available equipment and procedure options: Measure wavelength from several crests and photograph the same region beyond the fixed gap. Design an investigation of how the source frequency affects the angular spread beyond a fixed gap. Include a reasoned hypothesis, an appropriate range, controls, repeat measurements, a results table or graph, and one specific limitation and safety measure. Do not invent experimental results.

Question

Accepted Answer

Vary the source frequency; measure the angular spread beyond a fixed gap. Predict At approximately fixed wave speed, lower frequency gives a longer wavelength and more noticeable spreading. Keep water depth, gap width, source amplitude and observation position constant, repeat each setting, and use the evidence to test the prediction. State a testable research question linking the source frequency to the angular spread beyond a fixed gap, rather than asking vaguely which arrangement is best. A suitable prediction is: At approximately fixed wave speed, lower frequency gives a longer wavelength and more noticeable spreading. Justify that prediction scientifically: Wave speed equals frequency times wavelength; gap-to-wavelength ratio affects diffraction. This is a hypothesis to test, not a result that the experiment must produce. Use 4, 5, 6, 7 and 8 Hz as the planned independent-variable settings. Measure the response using the supplied equipment: Measure wavelength from several crests and photograph the same region beyond the fixed gap. Record quantities with units before calculating any derived result. Keep water depth, gap width, source amplitude and observation position constant. This isolates the proposed cause; changing these conditions at the same time would allow competing explanations for any difference. Take at least three independent trials at each setting, resetting the apparatus each time. Tabulate the setting, individual responses and mean; plot the mean response against the changed quantity and show the range of repeated values. Evaluate this specific limitation: Wave speed may vary with wavelength; measure wavelength rather than assume it changed by an exact factor. More repeats alone do not necessarily correct a biased method. Protect participants and equipment by this precaution: Keep water away from power supplies and use only teacher-approved low-voltage apparatus.

Same entrance, different waves

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