NCERT Class 12 Physics Chapter 12 Atoms Solutions: The 2025 Board exams are around the corner and it is time for the students to revise the syllabus and start practising the questions or the sample papers provided. This article will help the students to get the solutions to NCERT Class 12 Physics Chapter 12 Atoms. If you are looking for the answers, then you get them here in one place. These solutions will help the students to understand the concept of Chapter 12 Atoms. The NCERT Solutions for Class 12 Chapter 12 Atoms will include all unsolved theories and numerical problems. Read to get NCERT solutions for Class 12 Physics, Chapter 12 all exercises.
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| CBSE Class 12 Physics Exam Pattern and Marking Scheme for 2025 |
NCERT Class 12 Physics Chapter-12 Atoms Solutions
1. Choose the correct alternative from the clues given at the end of 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 non-uniform 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.)
2. 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?
3. 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?
4. The ground state energy of the hydrogen atom is –13.6 eV. What are the kinetic and potential energies of the electron in this state?
5. A hydrogen atom initially at the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of the photon.
6. (a) Using Bohr’s model calculates the speed of the electron in a hydrogen atom in the n = 1, 2, and 3 levels.
(b) Calculate the orbital period in each of these levels.
The answers to these questions and many more are given in the PDF attached in the below link. Click to see the answers:
Now, that the students have got the question-answer PDF, they can start preparing for the exam to score well.
CBSE Class 12 Physics Question Typology 2024-25
| S No. | Typology of Questions | Total Marks | Approximate Percentage |
| 1 | Remembering: Exhibit memory of previously learned material by recalling facts, terms, basic concepts, and answers. Understanding: Demonstrate understanding of facts and ideas by organizing, comparing, translating, interpreting, giving descriptions, and stating main ideas | 27 | 38 % |
| 2 | Applying: Solve problems in new situations by applying acquired knowledge, facts, techniques and rules in a different way. | 22 | 32% |
| 3 | Analysing: Examine and break information into parts by identifying motives or causes. Make inferences and find evidence to support generalizations Evaluating: Present and defend opinions by making judgments about information, validity of ideas, or quality of work based on a set of criteria. Creating: Compile information together in a different way by combining elements in a new pattern or proposing alternative solutions. | 21 | 30% |
| Total Marks | 70 | 100 | |
| Practical | 30 | ||
| Gross Total | 100 |
Also, check
- CBSE 12th Date Sheet 2025 Download PDF
- CBSE Class 12 Physics Study Material for 2025
- CBSE Class 12 Physics Most Repeated Questions
- CBSE Class 12 Physics Competency-Based Questions With Answer Key 2024-25
- CBSE Class 12 Physics Topper Answer Sheet for 2025 Exams
- CBSE Class 12 Physics 90 Days Study Plan for 2025 Exam
- NCERT Solutions for Class 12 (2024-2025) All Subjects
- NCERT Books for CBSE Class 12 - Latest Edition
- NCERT Rationalised Content for Class 12
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