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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