NEET2025PhysicsRotational MotionActual
The 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.
Options
- A100 days
- B105 days
- C115 days
- D108 days
Correct answer
D. 108 days
Step-by-step solution
Angular Momentum conservation array l|l I ₁ ₁= I ₂ ₂ & M = same ₂= ₁ 4 & R ₂=2 r ₁ T= 2 & I r ^2 & I ₂=4 I ₁ & ~T ₁=27 day array aligned & T ₂=4 ~T ₁=4 27 & ~T ₂=108 days aligned