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# (a) Calculate the angular momentum of the Moon due to its orbital motion about Earth. In your calculation use $3.84 \times$ $10^{8} \mathrm{m}$ as the average Earth-Moon distance and $2.36 \times 10^{6} \mathrm{s}$ as the period of the Moon in its orbit. (b) If the angularmomentum of the Moon obeys Bohr's quantization rule $(L=n \hbar),$ determine the value of the quantum number $n .$ (c) By what fraction would the Earth-Moon radius have to be increased to increase the quantum number by 1?

## a) $2.89 \times 10^{34} \mathrm{kg} . \mathrm{m^2} / \mathrm{s}$b) $2.75 \times 10^{68}$c) $7.30 \times 10^{-69}$

Atomic Physics

Nuclear Physics

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