Question

The radius of electron's second stationary orbit in Bohr's atom is $R$ The radius of 3rd orbit will be

• A. $\frac{ R }{3}$
• B. $9 R$
• C. $2.25 R$
• D. $3 R$

Answer 1

Answer: (C)

$2.25 R$

Answer 2

r=0.529×zn2​
r∝n2
R∝(2)2
R1​∝(3)2
Divide (1) by (2) RR1​​=94​
R1​=49R​
R1​=2.25R