Answer
0.10 m.
Work Step by Step
Looking at figure 11-41b, we see that successive nodes are a half-wavelength apart.
$$\Delta x_{node} = \frac{1}{2}\lambda=\frac{1}{2}\frac{v}{f}=\frac{1}{2}\frac{97 m/s}{475 Hz}\approx 0.10 m$$
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