The condition for a stable wave in an orbit of radius $r$ is given by the de Broglie relationship where the circumference of the orbit must be an integral multiple of the wavelength.
- A$n\lambda = 2\pi r$
- B$n\lambda = \frac{1}{2}\pi r$
- C$n\lambda = 8\pi r$
- D$n\lambda = 4\pi r$
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