12.9 In accordance with the Bohr's model

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Problem

12.9 In accordance with the Bohr's model, find the quantum number that characterises the earth's revolution around the sun in an orbit of radius

1.5 \times 10^{11} \,\mathrm{~m}

with orbital speed

3 \times 10^{4} \,\mathrm{~m} / \,\mathrm{s}

. (Mass of earth

=6.0 \times 10^{24} \,\mathrm{~kg}