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The diagram of the standing wave pattern shows a collection of nodes and antinodes with the nodes being present on the ends. As mentioned in the Know the Law section, the nodes are separated by one-half of a wavelength. Start on the left end and count the number of one-half wavelengths which are in the entire length of rope. Then write an equation in which you express the relationship between the length (L) of the rope and the number of one-half wavelengths. For example, L = 7•(1/2•λ). Substitute the value of L into your equation and solve for the wavelength (λ).
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