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The electron in a hydrogen atom jumps from the ground state to the higher energy state where its velocity is reduced to one-third of its initial value. If the radius of the orbit in the ground state is r, the radius of new orbit will be

a
3r
b
9r
c
r3
d
r9

detailed solution

Correct option is B

v∝1nSince v is reduced to one-third, therefore n = 3.Now, r∝n2So, radius of new orbit will be 9r.

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