A class uses a shallow ripple tank or a calibrated wave simulation to investigate a wave model. Available equipment and procedure options: Use one photograph and a scale to measure the same two crest-direction boundaries at several distances. Design an investigation of how the observation distance beyond a fixed narrow gap affects the width between two selected spreading wave directions. 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 observation distance beyond a fixed narrow gap; measure the width between two selected spreading wave directions. Predict The measured fan width should grow with distance even if its angular spread is unchanged. Keep gap, wavelength, water depth and selected boundary directions constant, repeat each setting, and use the evidence to test the prediction. State a testable research question linking the observation distance beyond a fixed narrow gap to the width between two selected spreading wave directions, rather than asking vaguely which arrangement is best. A suitable prediction is: The measured fan width should grow with distance even if its angular spread is unchanged. Justify that prediction scientifically: A fixed pair of diverging directions becomes farther apart as distance from the gap increases. This is a hypothesis to test, not a result that the experiment must produce. Use 2, 4, 6, 8 and 10 cm as the planned independent-variable settings. Measure the response using the supplied equipment: Use one photograph and a scale to measure the same two crest-direction boundaries at several distances. Record quantities with units before calculating any derived result. Keep gap, wavelength, water depth and selected boundary directions 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: Do not redefine the visible fan edge at each distance, because contrast fades with distance. 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.

Does a wave fan get wider?

What a complete response should do

How did this one feel?