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Q.

The radius of electron's second stationary orbit in Bohr's atom is R. The radius of the third orbit will be

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a

3 R

b

2.25 R

c

9 R

d

R3

answer is B.

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Detailed Solution

r∝n2 ⇒r(n=2)r(n=3)=49⇒r(n=3)=94R=2.25 R
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