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The earth revolves around the sun in an orbit of radius 1.5 × 10¹¹ m with orbital speed 30 km/s. Find the quantum number that characterises its revolution using Bohr's model in this case (mass of earth = 6.0 × 10²⁴ kg).
The ratio of the magnitude of magnetic moment to that of angular momentum, of an electron revolving around the nucleus in a hydrogen atom is :
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