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Question

- 8.1 days
- 81 days
- 27 days
- 2.7 days

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Solution

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M=5.98×1024kg

R=3.8×108km

The orbital time period of moon,

T=2π√R3GM

T=2×3.14√(3.8)3×10246.67×10−11×5.48×1024

T=23.2427×105sec

In days,

Time period, T=23.2427×10560×60×24day

T=27 days

The correct option is A.

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