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Class 12 Physics - Chapter 12: Atoms MCQ Questions

9 Questions 18 Minutes
Answered: 0 / 9Unanswered: 9

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  1. 1LearnNCERT Solutions
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Question 1

If the series limit frequency of the Lyman series is vL, then the series limit frequency of the Pfund series is:

Question 2

Hydrogen (H( _{ 1 }^{1})), deuterium (H( _{ 1 }^{2})), singly ionised helium (He( _{ 2 }^{4}))+ and doubly ionised lithium (Li( _{ 3 }^{6}))++ all have one electron around their nucleus. Consider an electron transition from n = 2 to n = 1 if the wavelengths of the emitted radiations are λ1, λ2, λ3 and λ4 respectively then approximately which of the following is correct?

Question 3

As an electron makes a transition from an excited state to the ground state of a hydrogen like atom/ion:

Question 4

The simple Bohr model cannot be directly applied to calculate the energy levels of an atom with many electrons. This is because

Question 5

A set of atoms in an excited state decay.

Question 6

The ground state energy of hydrogen atom is -13.6 eV. The kinetic and potential energies of the electron in this state are

Question 7

The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is

Question 8

An electron from various excited states of hydrogen atom emits radiation to come to the ground state. Let λn, λg be the de-Broglie wavelength of the electron in the nth state and the ground state respectively. Let ∧n be the wavelength of the emitted photon in the transition from the nth state to the ground state. For large n (A, B are constants)

Question 9

Ionisation energy for hydrogen atom in the ground state is E. What is the ionisation energy of Li++ atom in the 2nd excited state

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