NCERT Solutions Class 12 Physics Chapter 12

VNCERT Solutions Class 12 Physics Chapter 12- Atoms

Extramarks provides comprehensive NCERT Solutions Class 12 Physics Chapter 12 based on the latest CBSE syllabus. The notes are prepared lucidly with stepwise explanations to help students boost confidence and gain complete knowledge about all concepts. They contain answers using coloured illustrations for all the questions present in the NCERT textbook. The experts at Extramarks have analyzed many CBSE previous year question papers and sample papers prior to preparing the notes to ensure that all the important topics are covered in the Solutions. Students can take full benefit of NCERT Solutions Class 12 Physics Chapter 12 provided by Extramarks to excel in their Class 12 exams. 

To gain a complete understanding of Chapter 12, students must recall the concepts introduced in the previous standard using the NCERT Solutions Class 11. In this chapter, advanced concepts of atoms are included. One will learn about Rutherford’s model, the Paschen series of spectral lines, the Bohr Model Of The Hydrogen Atom, etc. There are many questions asked from this chapter in the CBSE exams and entrance examinations like NEET and JEE.

If you are looking for perfect study material for Relations and Function, you may refer to Extramarks NCERT Solutions Class 12 Mathematics Chapter 12. As a student, you can also view chapter-wise NCERT Solutions from Class 1 to Class 12. Using these reference notes will help students to revise and attain perfect scores. 

Key Topics Covered In NCERT Solutions Class 12 Physics Chapter 12

The Extramarks NCERT Solutions Class 12 Physics Chapter 12 provides apt information and knowledge about important concepts of Atomic Physics. With this chapter, students will get a hold of the fundamental concepts and properties of atoms. These concepts would go a long way in many science and engineering-oriented curriculum.

Based on the latest syllabus, the main topics covered in NCERT Solution for Class 12 Physics Chapter 12 are given below:

A brief of the main topics covered in NCERT Solution for Class 12 Physics Chapter 12 is below.

12.1 Introduction

Chapter 12 Physics class 12 is based on Thomson’s, Rutherford’s, and Bohr’s atomic models and application of Mosley’s law. The chapter includes concepts of Alpha-Particle Trajectory, Electron Orbits, and the genesis of spectra. The NCERT Solutions Class 12 Physics Chapter 12 also describes fundamentals and principles associated with the structure of atoms, H2 atoms, and X-rays. Students also gain an insight into the advanced concepts of atoms like emission and absorption of energy, Coolidge Tubes, and applications in machines in our everyday lives. 

The main features of the chapter are

• The Rutherford Atomic Model
• Equations by Bohr
• Line spectrum 
• Energy levels of different atoms
• Production of X-rays
• De Broglie’s Hypothesis

12.2 Alpha-Particle Scattering And Rutherford’s Nuclear Model Of Atom

In this section of Chapter 12, students are introduced to various fundamentals of atoms like electron orbit, Kinetic, potential, total energy, etc. The structure of the atom using the Dalton’s atomic theory with its pros, cons, and limitations is explained in the NCERT Solutions Class 12 Physics Chapter 12. Furthermore, the Thomson model of the atom, also known as the watermelon model, is described using diagrams and coloured illustrations. Students can also find a detailed description of Rutherford’s nuclear model of the atom and its drawbacks. 

There are various formulae included in this section. Students are advised to solve sums based on these formulae included in the NCERT Solutions Class 12 Physics Chapter 12. 

12.3 Atomic Spectra

In the NCERT Solutions Class 12 Physics Chapter 12, information regarding the atomic spectra is given in detail using diagrams and graphs. Within this section, students learn about the three types of atomic spectra, namely emission spectra,  absorption spectra, and continuous spectra. Students will also gain knowledge about Hydrogen spectra under the topic of spectral series. Explanation of different types of spectral series like Balmar series, Lyman series, Paschen Series, and Pfund series with their formulae is mentioned in the NCERT Solutions. 

In the CBSE exams, various numerical questions are asked based on the formulas from this section. Extramarks NCERT Solutions Class 12 Physics Chapter 12 covers all the essential formulae for reference.

12.4 Bohr Model Of The Hydrogen Atom

This section of NCERT Solutions Class 12 Physics Chapter 12 summarises the drawbacks of Rutherford’s atomic model to the Hydrogen model of Bohr. Bohr’s three postulates explain stationary states, stable orbits, and quantization of moving electrons. Topics like angular momentum, Bohr’s radius, and velocity of electrons are explained in detail in this section. With help from NCERT Solutions Class 12 Physics Chapter 12, students can also gain an in-depth understanding of discrete energy levels in Bohr’s model. The drawbacks of the Bohr model are also included. 

12.5 The Line Spectra Of The Hydrogen Atom

Within this section, detailed information about fundamentals like Excitation Energy, Ionisation Energy, Excitation Potential, and Ionisation Potential is included. 

12.6 De Broglie’s Explanation Of Bohr’s Second Postulate Of Quantisation

The NCERT Solutions Class 12 Physics Chapter 12 will be very helpful in order to study De Broglie’s equation which gives the wave-particle nature of matter. Using the De Broglie relation, students will be able to solve numerical questions and find out the energy and wavelength of a photon. 

The NCERT Solutions Class 12 Physics Chapter 12 includes all answers, formulas, derivations, and solved examples in one place. Students can refer to these notes for a quick revision before the exam. Students may click on the respective topics to access the NCERT Solutions Class 12 Physics Chapter 12.

List of NCERT Solutions Class 12 Physics Chapter 12 Exercise & Answer Solutions

To attain good scores and excel in exams, students should study with the help of the NCERT Solutions Class 12 Physics Chapter 12. Extramarks provides these NCERT Solutions, which are beneficial for understanding atomic Physics. These solutions offer all detailed explanations, numerical questions, and answers. It offers in-depth knowledge of all concepts included in the atoms class 12 NCERT solutions. Students may click here to access the NCERT Solutions Class 12 Physics Chapter 12.

To provide students with the best study resources, Extramarks provides NCERT Solutions for all primary and secondary school sections, which can be accessed by clicking on the links below. 

NCERT Solutions Class 1

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NCERT Solutions Class 12

NCERT Exemplar Class 12 Physics

The NCERT Exemplar Class 12 Physics makes learning easy and simplified. The Extramarks online platform provides 100% reliability to enable a proper understanding of all complex concepts. With NCERT Solutions Class 12 Physics Chapter 12, students can prepare for CBSE school tests as well as other competitive examinations. The notes prepared by subject elites aim to strengthen the foundation with its easy-to-read and effective solutions.

Chapter 12 comes under unit 8- Atomsand Nuclei. Unit 7 and Unit 8 together carry 12 marks in the CBSE board exam. This chapter has good weightage in the boards as well as in JEE and NEET. Students may study using NCERT textbooks, CBSE reference books, NCERT Solutions Class 12 Physics Chapter 12, and other study materials provided by Extramarks. 

Key Features of NCERT Solutions Class 12 Physics Chapter 12

The key features of Atoms class 12 NCERT solutions offered by Extramarks are as follows

• The notes are prepared by subject matter experts by carrying out extensive research. Previous year question papers and sample papers are used for reference.
• Chapter 12 NCERT solutions class 12 Physics includes key points, formulas, equations that allows quick reference. 
• The solutions are made lucidly in an easy language to enhance the students’ exam preparation level. 
• In case of any doubts or difficulties, students are advised to use NCERT Solutions Class 12 Physics Chapter 12 to understand the topic and clear their doubts. 
• Students can access these notes on any device like mobiles, tabs, laptops, etc. 
• It covers all topics with plenty of examples and informative diagrams and graphs.