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  4. In accordance with the Bohr's model, the quantum number that characterises the Earth's revolution around the sun in an orbit of radius 1.5 × 1011 m with orbital speed 3 × 104 ms -1 is [given mass of Earth =6 × 1024 kg ]

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Q. In accordance with the Bohr's model, the quantum number that characterises the Earth's revolution around the sun in an orbit of radius $1.5 \times 10^{11} m$ with orbital speed $3 \times 10^{4} ms ^{-1}$ is
[given mass of Earth $=6 \times 10^{24} kg$ ]

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Solution:

$m v_{0} r=n \frac{h}{2 \pi}$