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Difference between nth and (n + 1)th Bohr’s radius of H-atom is equal to its (n – 1)th Bohr’s radius. The value of n is:

Difference between nth and (n + 1)th Bohr’s radius of H-atom is equal to its (n – 1)th Bohr’s radius. The value of n is:
a) 1
b) 2
c) 3
d) 4

Answer: d
Explanation: rn n2
But rn + 1 – rn = rn – 1
(n + 1)2 – n2 = (n – 1)2
n = 4

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