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Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom — Important Questions

ICSE · Class 12 · Physics

59 important questions from Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom for ICSE Class 12 Physics, with answers.

59 questions35 flashcards7 formulas & key relations5 concepts

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59 Questions·
multiple choicemultiple correct

Important Questions from Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom

1multiple choice
3 marks

In a hydrogen-like atom with atomic number Z = 3, what is the radius of the third orbit? Use rn = (0.53)n^2/Z Å.

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1.59 Å

Use rn = (0.53)n^2/Z Å. For n = 3 and Z = 3, r3 = 0.53 × 9 / 3 = 1.59 Å.

2multiple choice
3 marks

For hydrogen, what is the speed of the electron in the second Bohr orbit if the speed in the first orbit is c/137?

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c/274

The speed varies as 1/n. If the first-orbit speed is c/137, then for n = 2 it becomes (c/137)/2 = c/274.

3multiple choice
3 marks

The energy of an electron in the ground state of hydrogen is -13.6 eV. What is the total energy of the electron in the fourth orbit?

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-0.85 eV

For hydrogen, En = -13.6/n^2 eV. For n = 4, En = -13.6/16 = -0.85 eV.

4multiple choice
3 marks

A hydrogen atom changes from n = 4 to n = 1. What is the energy of the emitted photon?

Show answer

12.75 eV

Energy at n = 4 is -0.85 eV and at n = 1 is -13.6 eV. The emitted photon energy is the difference: -0.85 - (-13.6) = 12.75 eV.

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What are the important topics in Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom for ICSE Class 12 Physics?
Key topics in Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom include Alpha-Particle Scattering and Rutherford's Nuclear Model, Bohr's Atomic Model and Postulates, Radii, Speed and Energy of Bohr Orbits, Discrete Energy Levels, Excitation and Ionisation. Study these first, then practise questions on each for the ICSE Class 12 board exam.
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Super Tutor has 59 practice questions for Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom, including multiple choice, multiple correct questions. A sample with answers is on this page.

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