According to Bohr's principle,the relation between principal quantum number $(n)$ and the radius of the orbit $(r)$ is:

  • A
    $r \propto n$
  • B
    $r \propto n^2$
  • C
    $r \propto \frac{1}{n}$
  • D
    $r \propto \frac{1}{n^2}$

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