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First orbit velocity of electron is 2.1×106m s-1, then the velocity of 3rd orbit electron is

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Important Questions on Atoms, Molecules and Nuclei

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The ionization potential of a hydrogen atom is 13.6eV. What will be the energy of the atom corresponding to n=2?
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Energy E of a hydrogen atom with principal quantum number n is given by E=-13.6n2eV. The energy of a photon ejected when the electron jumps from n=3 state to n=2 state of hydrogen is approximately
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For the hydrogen atom, the energy of radiation emitted in the transition from 4th excited state to 2nd  excited state, according to Bohr's theory is
 
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Energy required for the electron excitation inLi++ from the first to the third Bohr orbit is
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The ionisation potential of hydrogen atom is 13.6 V. The energy required to remove an electron in the n=2 state of the hydrogen atom is 
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An electron collides with a hydrogen atom in its ground state and excites it to n=3 state. The energy given to the hydrogen atom in this inelastic collision (neglecting the recoil of hydrogen atom) is
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The ground state energy of hydrogen atom is -13.6 eV. What is the potential energy of the electron in this state?
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The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is