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Chapters
2: Electrostatic Potential and Capacitance
3: Current Electricity
4: Moving Charges and Magnetism
5: Magnetism and Matter
6: Electromagnetic Induction
7: Alternating Current
8: Electromagnetic Waves
9: Ray Optics and Optical Instruments
10: Wave Optics
11: Dual Nature of Radiation and Matter
▶ 12: Atoms
Chapter 13: Nuclei
Chapter 14: Semiconductor Electronics: Materials, Devices and Simple Circuits
![NCERT solutions for Physics [English] Class 12 chapter 12 - Atoms - Shaalaa.com](/images/physics-english-class-12_6:ecf5a31cda3a46679a04fc327e398323.jpg "NCERT solutions for Physics [English] Class 12 chapter 12 - Atoms")
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Solutions for Chapter 12: Atoms
Below listed, you can find solutions for Chapter 12 of CBSE, Karnataka Board PUC NCERT for Physics [English] Class 12.
NCERT solutions for Physics [English] Class 12 12 Atoms EXERCISES [Page 305]
Choose the correct alternative from the options given for the statements.
The size of the atom in Thomson’s model is ______ the atomic size in Rutherford’s model.
much greater than
no different from
much less than
In the ground state of ______ electrons are in stable equilibrium, while in ______ electrons always experience a net force.
Thomson’s model
Rutherford’s model
A classical atom based on ______ is doomed to collapse.
Thomson’s model
Rutherford’s model
An atom has a nearly continuous mass distribution in a ______ but has a highly non-uniform mass distribution in ______.
Thomson’s model
Rutherford’s model
The positively charged part of the atom possesses most of the mass in ______.
Rutherford’s model
both the models
Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of the gold foil. (Hydrogen is a solid at temperatures below 14 K.) What results do you expect?
A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom makes a transition from the upper level to the lower level?
The ground state energy of a hydrogen atom is −13.6 eV. What are the kinetic and potential energies of the electron in this state?
A hydrogen atom initially in the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of the photon.
- Using the Bohr’s model, calculate the speed of the electron in a hydrogen atom in the n = 1, 2 and 3 levels.
- Calculate the orbital period in each of these levels.
The radius of the innermost electron orbit of a hydrogen atom is 5.3 × 10−11 m. What are the radii of the n = 2 and n = 3 orbits?
A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?
In accordance with the Bohr’s model, find the quantum number that characterises the earth’s revolution around the sun in an orbit of radius 1.5 × 1011 m with orbital speed 3 × 104 m/s. (Mass of earth = 6.0 × 1024 kg)
Solutions for 12: Atoms
NCERT solutions for Physics [English] Class 12 chapter 12 - Atoms
Shaalaa.com has the CBSE, Karnataka Board PUC Mathematics Physics [English] Class 12 CBSE, Karnataka Board PUC solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. NCERT solutions for Mathematics Physics [English] Class 12 CBSE, Karnataka Board PUC 12 (Atoms) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
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Concepts covered in Physics [English] Class 12 chapter 12 Atoms are Alpha-particle Scattering and Rutherford’s Nuclear Model of Atom, Atomic Spectra, Bohr’s Model for Hydrogen Atom, The Line Spectra of the Hydrogen Atom, De Broglie’s Explanation of Bohr’s Second Postulate of Quantisation, Heisenberg and De Broglie Hypothesis, Thompson Model, Dalton's Atomic Theory, Introduction of Atoms, Energy Levels, Hydrogen Spectrum, Overview: Atoms, Alpha-particle Scattering and Rutherford’s Nuclear Model of Atom, Atomic Spectra, Bohr’s Model for Hydrogen Atom, The Line Spectra of the Hydrogen Atom, De Broglie’s Explanation of Bohr’s Second Postulate of Quantisation, Heisenberg and De Broglie Hypothesis, Thompson Model, Dalton's Atomic Theory, Introduction of Atoms, Energy Levels, Hydrogen Spectrum, Overview: Atoms.
Using NCERT Physics [English] Class 12 solutions Atoms exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in NCERT Solutions are essential questions that can be asked in the final exam. Maximum CBSE, Karnataka Board PUC Physics [English] Class 12 students prefer NCERT Textbook Solutions to score more in exams.
Get the free view of Chapter 12, Atoms Physics [English] Class 12 additional questions for Mathematics Physics [English] Class 12 CBSE, Karnataka Board PUC, and you can use Shaalaa.com to keep it handy for your exam preparation.
