We provided NCERT Solutions for Class 12 Physics Chapter 12 Atoms is prepared by the best teachers across India. These NCERT 12th Class Physics Chapter 12 Atoms Solution includes detailed answers of all the questions in Chapter 12 Atoms provided in NCERT Book which is prescribed for Class 12 in CBSE school Books. This will help students to understand basic concepts better.
CBSE NCERT 12th Class Physics Chapter 12 Atoms Solutions
| Organisation | National Council of Educational Research and Training |
| Class Name | 12th Class |
| Subject Name | Physics |
| Chapter Name | Chapter 12 |
| Content name | Atoms |
| Category Name | CBSE NCERT Solutions |
| Official Website | http://ncert.nic.in/ |
NCERT 12th Class Physics Chapter 12 Atoms Solution is given below
| Section Name | Topic Name |
| 12 | Atoms |
| 12.1 | Introduction |
| 12.2 | Alpha-particle Scattering and Rutherford’s Nuclear Model of Atom |
| 12.3 | Atomic Spectra |
| 12.4 | Bohr Model of the Hydrogen Atom |
| 12.5 | The Line Spectra of the Hydrogen Atom |
| 12.6 | DE Broglie’s Explanation of Bohr’s Second Postulate of Quantisation |
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.
