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The angular momentum of an electron in a hydrogen atom is proportional to (where n is principle quantum number)

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Important Questions on Atoms

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What is the angular momentum of an electron in Bohr's hydrogen atom, whose energy is -0.544 eV?
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The energies of three conservative energy levels L3, L2 and L1 of hydrogen atom are E0, 4E09 and E04 respectively. A photon of wavelength λ is emitted for a transition L3 to L1. What will be the wavelength of emission for transition L2 to L1 ?
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When an electron is excited to nth  excited energy state in hydrogen atom, then the possible number of spectral lines emitted are
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In which transition of a hydrogen atom, photons of lowest frequency are emitted?
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The binding energy of an electron in 4th orbit of hydrogen atom is
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Three energy levels L1, L2 and L3 of a hydrogen atom correspond to increasing values of energy i.e., EL1<EL2<EL3. If the wavelength corresponding to the transitions L3 to L2, L2 to L1 and L3 to L1 are λ3, λ2 and λ1 respectively then
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The radius of first orbit of hydrogen atom is 0.53 A. The radius of its fourth orbit will be
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In Bohr's model of the hydrogen atom the ratio between the period of revolution of an electron in the orbit of n=1 to the period of the revolution of the electron in the orbit n=2 is:-