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12th CBSE
IMPORTANT
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The simple Bohr model cannot be directly applied to calculate the energy levels of an atom with many electrons. This is because:

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Important Questions on Atoms

EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>MCQ>Q 12.4
According to the simple Bohr model, for the ground state, the electron in the H-atom has an angular momentum h. Angular momentum is a vector and hence there will be infinitely many orbits with the vector pointing in all possible directions. In actuality, this is not true.
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12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>MCQ>Q 12.5
O2 molecule consists of two oxygen atoms. In the molecule, nuclear force between the nuclei of the two atoms
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>MCQ>Q 12.6
Two H atoms in the ground state collide inelastically. The maximum amount by which their combined kinetic energy is reduced is
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>MCQ>Q 12.7
A set of atoms in an excited state decays.
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>MCQ>Q 12.8
An ionised H-molecule consists of an electron and two protons. The protons are separated by a small distance of the order of angstrom. In the ground state,
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>MCQ>Q 12.9
Consider aiming a beam of free electrons towards free protons. When they scatter, an electron and a proton cannot combine to produce a H-atom,
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12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>MCQ>Q 12.1
The Bohr model for the spectra of a H-atom
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>MCQ>Q 12.11
The Balmer series for the H-atom can be observed