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Let R₁ be the radius of the second stationary orbit and R₂ be the radius of the fourth stationary orbit of an electron in Bohr's model. The ratio (R₁)/(R₂) is :
Asked in Re-NEET 2022 · Postulates, radius, speed and angular momentum
- (1) 4
- (2) 0.25
- (3) 0.5
- (4) 2
Answer: (2) 0.25
Step-by-step solution
rₙ∝ n².
(R₁)/(R₂)=(2²)/(4²)=1/4=0.25.
Why the other options are wrong
- (1) The inverse ratio, (R₂)/(R₁).
- (3) Takes the radius as proportional to n: 2/4. In fact r∝ n².
- (4) Takes r∝ n and inverts the ratio.
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