Question:

In Bohr model, for large $n$, spacing between consecutive orbits is proportional to

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Always expand $(n+1)^2 - n^2$ for spacing questions.
  • $\sqrt{n}$
  • $n$
  • $n^2$
  • $n^3$
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The Correct Option is B

Solution and Explanation

Bohr radius: \[ r_n = n^2 a_0 \]

Step 1: Distance between consecutive orbits
\[ \Delta r = r_{n+1} - r_n \] \[ = (n+1)^2 a_0 - n^2 a_0 \] \[ = (2n+1)a_0 \]

Step 2: For large $n$
\[ \Delta r \approx 2n a_0 \propto n \] Final Answer: \[ \boxed{(B)} \]
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