A) \[\sqrt{nb\lambda }\]
B) \[\sqrt{b\lambda }\,[\sqrt{n}-\sqrt{n-1}]\]
C) \[(\sqrt{n}\,-\,\sqrt{n-1})\]
D) \[\frac{\sqrt{b\lambda }}{[\sqrt{n}\,-\sqrt{n-1}]}\]
Correct Answer: B
Solution :
Width of nth HPZ \[{{B}_{n}}={{r}_{n}}-{{r}_{n-1}}\] \[{{r}_{n}}=\sqrt{nb\lambda }\], \[{{r}_{n-1}}=\sqrt{(n-1)b\lambda }\] \[{{B}_{n}}=\sqrt{nb\lambda }-\sqrt{(n-1)b\lambda }=\sqrt{b\lambda }\,[\sqrt{n}-\sqrt{(n-1)}]\]
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