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`        In an atom two electrons are moving in orbits of radii r and 9r. The ratio of time takenby them to complete one revolution isOptions:(a) 1:9(b) 1:3(c) 1:27(d) 1:6 `
one month ago

1797 Points
```							v is inversely proportional to sqrt(R)so, va/vb= sqrt(9/1)= 3now, ta/tb= (2pi*r/va)/(2pi*(9r)/vb)so, ta/tb= (r/va)*(vb/9r)= (1/9)*(vb/va)= 1/9 * 1/3= 1/27kindly approve :)
```
one month ago
Vikas TU
9756 Points
```							Dear student Time taken to complete a single revolutionT = path distance / velocityorT = 2πr/v  (1)here we assume that the linear velocity remains constant i every orbit.so,T1 = 2πr1/v  (2)where r1 = RandT2 = 2πr2/v  (3)wherer2 = 9Rthus, the ratio of time taken will beT1/T2 = (2πr1/v) / 2πr2/v  orT1/T2 = 2πR/2π(9R) = 2πR/18πRthus.T1/T2 = 1/9Hope this information will clear your doubts about topic.Good Luck
```
one month ago
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• 141 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions