Question
Download Solution PDFThe Sun rotates around its centre once in 27 days. What will be the period of revolution if the Sun were to expand to twice its present radius without any external influence? Assume the Sun to be a sphere of uniform density.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCorrect option is: (4) 108 days
Assuming the Sun to be a solid sphere, I = (2/5) m R2
Using conservation of angular momentum, I'ω' = Iω
⇒ (2/5) m (2R)2 × (2π / T') = (2/5) m R2 × (2π / T)
⇒ T' = 4T = 4 × 27 = 108 days
Last updated on Jun 16, 2025
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