A) 180.5 min
B) 100 min
C) 90.5 min
D) 84.5 min
Correct Answer: D
Solution :
For maximum time period \[l\approx {{R}_{e}}=6400\,km\] As \[T=2\pi \sqrt{\frac{l}{g}}=2\times \pi \sqrt{\frac{600\times {{10}^{3}}}{9.8}}\] or \[T=84.5\,\min \]
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