Concept explainers
Obtain a piece of paper and a transparency with concentric circles on them. The circles represent wave fronts generated by each of two point sources.
Suppose that the two sources arc in phase and at the same location. Overlay the transparency on the paper to model this situation.
Explain why there are no nodal lines in this case.
Gradually increase the source separation until you first see nodal lines.
In the space at right, sketch the nodal lines and the lines of maximum constructive interference for this situation.
What is the source separation when this occurs?
Why can there be no nodal lines for a smaller source separation? Explain. (Hint: For a given source separation, what is the largest possible value of
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