EASY
12th CBSE
IMPORTANT
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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,

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Important Questions on Atoms

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,
EASY
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
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>MCQ>Q 12.12
Let En=-18ε02me4n2h2 be the energy of the nth level of H-atom. If all the H-atoms are in the ground state and radiation of frequency (E2-E1)/h falls on it,
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>MCQ>Q 12.13
The simple Bohr model is not applicable to He4 atom because
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>VSA>Q 12.14
The mass of a H-atom is less than the sum of the masses of a proton and electron. Why is this?
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>VSA>Q 12.15
Imagine removing one electron from He4 and He3. Their energy levels, as worked out on the basis of the Bohr model will be very close. Explain why.
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 12 - Atoms>VSA>Q 12.16
When an electron falls from a higher energy to a lower energy level, the difference in the energies appears in the form of electromagnetic radiation. Why cannot it be emitted as other forms of energy?