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`        A planet of mass ‘m’ moves around the sun of mass “M” i an elliptical orbit. The maximum and minimum distance of planet from the sun are r and r’ respectively. The time period of planet is proportional to (a) r+r’(b) (r+r’)^1/2(c)(r-r’)^3/2(d) (r+r’)^3/2 Please help`
one year ago

Arun
22540 Points
```							Dear student According to Kepler's lawT² is proportional to cube of semi major axis of elliptical orbit. Now semi major axis = (r + r')/2 T² is proportional to [(r +r')/2]³ T is proportional to  [(r + r')/2 ]3/2 Hence option D is correct. RegardsArun (askIITians forum expert)
```
one year ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions