NCERT Solutions Class 12 Physics Chapter 11

NCERT Solutions Class 12 Physics Chapter 11- Dual Nature of Radiation and Matter

The NCERT Solutions Class 12 Physics Chapter 11 provided by Extramarks are a vital study material to make students well equipped for the important CBSE Class 12 Board examinations. The notes aim to help students gain an in-depth understanding of all concepts to avoid difficulty understanding higher and more complex topics. Every minute detail is explained with various techniques to make learning effective. Our solutions are based on the revised guidelines issued by the CBSE with reference to the NCERT’s latest syllabus. 

Dual Nature of Radiation and Matter is a crucial chapter from an exam point of view. Using Maxwell’s equations of electromagnetism and Hertz’s experiments on the generation and detection of EM waves, the chapter gives brief information about the wave nature of light. In addition, one will learn about the Electron Emission, Photoelectric Effect, and Einstein’s equation for Energy Quantum Of Radiation. With help from NCERT Solutions Class 12 Physics Chapter 11, students can solve many MCQs, the theoretical and numerical questions to score high marks.

Students may visit the Extramarks website to get all the latest news and information about the CBSE examinations. In addition to higher classes, Extramarks caters to the educational needs of primary and secondary school. Primary school students can find NCERT Solutions Class 1 to NCERT Solutions Class 5 on Extramarks. Secondary section NCERT Solutions Class 6 to NCERT Solutions Class 10 and NCERT Solutions Class 11 is also available for students for free. 

Key Topics Covered In NCERT Solutions Class 12 Physics Chapter 11

In NCERT Solutions Class 12 Physics Chapter 11, students can expect many objective and subjective questions based on all topics of the chapter. From a basic introduction to the chapter to a detailed explanation of other topics such as observations on the photoelectric effect, absorption of energy, experimental study of the photoelectric effect, wave nature of matter, etc., are covered in this chapter. Studying this chapter will strengthen the foundation of the Dual Nature of the light and light-matter relationship for many competitive examinations such as NEET and JEE (Main and Advanced) exams. 

The key topics covered in chapter 11 are as follows: 

11.1 Introduction

In the introductory part, the dual wave nature of lights and the work function of a metal is discussed in this chapter. Students study phenomena such as diffraction, interference, and polarisation in this chapter. 

The NCERT Solutions Class 12 Physics Chapter 11 helps students get clarity and essential topics of the syllabus. In addition, students get a clear idea of what is present in the curriculum. Some of the main features of this chapter are as follows: 

• Dual Nature of Radiation
• Photoelectric Effect
• Experimental study of Photoelectric effect
• Einstein’s Photoelectric equation – Particle nature of light
• Hertz and Lenard’s Observations
• Matter waves – Wave nature of particles, and de Broglie relation

11.2 Electron Emission

This section helps students strengthen their understanding of the phenomenon of the emission of photoelectrons. In the NCERT Solutions Class 12 Physics Chapter 11, this sector covers all the basics and paves the way towards complex concepts. As a result, students get a good experience and the overall idea of the main topics. 

11.3 Photoelectric Effect

Within this section, students will be introduced to the phenomenon of the Photoelectric effect, which is defined as the conversion of light to electrical energy based on the law of conservation of energy. Students will also learn about the Factors affecting photoelectric current. Hertz’s observations and Hallwachs’ and Lenard’s observations based on the photoelectric emission are included in this part. 

11.4 Experimental Study Of Photoelectric Effect

This section is bifurcated into three parts:

• Effect of intensity of light on photocurrent gives the relation between photocurrent and number of photoelectrons. 
• The effect of potential on the photoelectric current gives information about saturation current.
• Effect of frequency of incident radiation on stopping potential, which explains the variation of photoelectric current against the potential difference between the plates.

11.5 Photoelectric Effect And Wave Theory Of Light

In this section of NCERT Solutions Class 12 Physics Chapter 11, the wave picture of light is explained using the observations on photoelectric emission studied in the previous section. 

11.6 Einstein’s Photoelectric Equation: Energy Quantum Of Radiation

Students will learn about the relation between electromagnetic radiation and the photoelectric effect proposed by Albert Einstein. In this section of NCERT Solutions Class 12 Physics Chapter 11, students will also learn about Planck’s constant and quanta of radiation energy. 

There are many numerical questions asked on Einstein’s photoelectric equation, which is given by 

Kmax = h–o. It will develop a better understanding of the relation of Stopping Potential (Vo) and Threshold Frequency (vo). 

11.7 Particle Nature Of Light: The Photon

This section of NCERT Solutions Class 12 Physics Chapter 11 summarizes the photon picture of electromagnetic radiation. It also explains the conservation of total energy and total momentum. Many solved examples are included in the NCERT textbook based on this concept. 

In the CBSE exams, various numerical questions are asked based on the formulas mentioned in this section. Extramarks NCERT Solutions Class 12 Physics Chapter 11 covers all the essential formulas for reference.

11.8 Wave Nature Of Matter

In this section, the wave nature of matter is explained using the Louis Victor de Broglie relation. He states the relation between wavelength (λ) and momentum (p) of a particle. There are various important formulas included in this part based on which students will have to solve numerical questions. This section of NCERT Solutions Class 12 Physics Chapter 11 includes a detailed explanation about the working and construction of a Photocell with a well-labelled diagram. Students will also learn about the Probability interpretation of matter waves with the help of sums. 

11.9 Davisson and Germer Experiment

Students will gain in-depth information about the wave nature of electrons through the Davisson and Germer Experiment. With the help of the circuit diagram in the NCERT Solutions Class 12 Physics Chapter 11, students can understand this topic well.

List of NCERT Solutions Class 12 Physics Chapter 11 Exercise & Answer Solutions

NCERT Solutions Class 12 Physics Chapter 11 is available on the Extramarks platform for free. It covers all the theoretical answers, stepwise derivations, and detailed explanations of numerical questions. The chapter 11 Physics class 12 NCERT solutions ensure a thorough understanding of all essential topics included in the chapter with graphical representation. To help students speed up their learning process, Extramarks provides NCERT Solutions for all secondary school classes.

Click on the below links to download practice questions and check the solutions for NCERT Solutions Class 12 Physics Chapter 11:

Students can also explore other NCERT Solutions for primary and secondary sections on our Extramarks website: 

• NCERT Solutions Class 1
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• NCERT Solutions Class 3
• NCERT Solutions Class 4
• NCERT Solutions Class 5
• NCERT Solutions Class 6
• NCERT Solutions Class 7
• NCERT Solutions Class 8
• NCERT Solutions Class 9
• NCERT Solutions Class 10
• NCERT Solutions Class 11

NCERT Exemplar Class 12 Physics

The NCERT Exemplar Class 12 Physics is accessible on the Extramarks online platform for all students from CBSE affiliated schools. The notes are 100% reliable as each minute detail has a proper explanation lucidly. The NCERT Exemplar books of each subject are very important for school examination preparation and other competitive exams. If students want to attain high scores, it is advised to use NCERT Solutions. 

The ch 11 Physics class 12 carries high weightage. Therefore, it is important for students to grasp the knowledge of all concepts with the help of the worksheets and the best study materials provided by Extramarks. 

Key Features of Class 12 Physics Chapter 11 NCERT Solutions

The Extramarks NCERT solutions class 12 Physics chapter 11 key features include

• At Extramarks, we provide concise and accurate NCERT solutions Class 12 Physics Chapter 11. These solutions are consistently updated and are based on the revised CBSE syllabus.
• The notes are prepared by Subject matter experts having years of experience.
• The NCERT Solutions Class 12 Physics Chapter 11 includes all minute details and is made in simple language for students to easily understand even the most complex concepts. 
• Students can use these notes to analyze themselves based on their preparation level. 
• Referring to the NCERT Solutions Class 12 Physics Chapter 11, students can apply their learnings to solve several numerical questions. 
• The CBSE revision notes are arranged in a chapter-wise and page-wise format to ease accessibility.