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Assertion: The hydrogen atom consists of only one electron, but its emission spectrum has many lines.

Reason: Only the Lyman series is found in the absorption spectrum of hydrogen atoms whereas in the emission spectrum all the series are found.

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Important Questions on Atomic Physics

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 1
When an α-particle of mass m moving with velocity v bombards on a heavy nucleus of charge 'Ze', its distance of closest approach from the nucleus depends on m as:
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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 2
The ionisation energy of the hydrogen atom in its ground state is 13.6 eV. The atoms are excited to higher energy levels to emit radiations of 6 wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between
 
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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 3

The energy of a hydrogen atom in the ground state is -13.6eV. The energy of a He+ ion in the first excited state will be

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 4
Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model?
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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 5
The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen like ion is
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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 6
Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths λ1:λ2 emitted in the two cases is:
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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 7
An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emissiór will be
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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 8
Ratio of longest wave lengths corresponding to Lyman and Balmer series in hydrogen spectrum is: