NCERT Solutions for Class 12 Physics Chapter 12 – Atoms

Get here NCERT Solutions for Class 12 Physics Chapter 12. These NCERT Solutions for Class 12 of Physics subject includes detailed answers of all the questions in Chapter 12 – Atoms provided in NCERT Book which is prescribed for class 12 in schools.

Book: National Council of Educational Research and Training (NCERT)
Class: 12th Class
Subject: Physics
Chapter: Chapter 12 – Atoms

NCERT Solutions for Class 12 Physics Chapter 12 – Atoms

Question 12.1:
Choose the correct alternative from the clues given at the end of the each statement:
(a) 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.)
(b) In the ground state of ………. electrons are in stable equilibrium, while in ………. electrons always experience a net force. (Thomson’s model/ Rutherford’s model.)
(c) A classical atom based on ………. is doomed to collapse. (Thomson’s model/ Rutherford’s model.)
(d) An atom has a nearly continuous mass distribution in a ………. but has a highly nonuniform
mass distribution in ………. (Thomson’s model/ Rutherford’s model.)
(e) The positively charged part of the atom possesses most of the mass in ………. (Rutherford’s model/both the models.)
Answer
(a) The sizes of the atoms taken in Thomson’s model and Rutherford’s model have the same order of magnitude.
(b) In the ground state of Thomson’s model, the electrons are in stable equilibrium. However, in Rutherford’s model, the electrons always experience a net force.
(c) A classical atom based on Rutherford’s model is doomed to collapse.
(d) An atom has a nearly continuous mass distribution in Thomson’s model, but has a highly non-uniform mass distribution in Rutherford’s model.
(e) The positively charged part of the atom possesses most of the mass in both the models.

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NCERT Solutions for Class 12 Physics All Chapters

• Chapter 1 – Electric Charges And Fields
• Chapter 2 – Electrostatic Potential And Capacitance
• Chapter 3 – Current Electricity
• Chapter 4 – Moving Charges And Magnetism
• Chapter 5 – Magnetism And Matter
• Chapter 6 – Electromagnetic Induction
• Chapter 7 – Alternating Current
• Chapter 8 – Electromagnetic Waves
• Chapter 9 – Ray Optics And Optical Instruments
• Chapter 10 – Wave Optics
• Chapter 11 – Dual Nature Of Radiation And Matter
• Chapter 12 – Atoms
• Chapter 13 – Nuclei
• Chapter 14 – Semiconductor Electronics Materials Devices And Simple Circuits
• Chapter 15 – Communication Systems

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