Constructive path difference
At a bright point in a harbour wave sensor, the order is \(m=3\) and wavelength is \(0.28\,\text{m}\). Calculate the required path difference. Use the diagram labels before calculating the requested value. Enter the numerical result and choose the interpretation that matches the wave physics.
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Worked practice: physics data and result
Read the physical quantities first, then calculate the result and state what it means.