NCERT Solutions Class 12 Physics Chapter 15

NCERT Solutions Class 12 Physics Chapter 15 – Communication systems

The NCERT Solutions Class 12 Physics Chapter 15 are one of the best academic resources to learn about the subject. These notes include all the topics and concepts from the Central Board of Secondary Education (CBSE) syllabus. With the help of the NCERT solutions, students can prepare for CBSE exams as well as many other competitive exams like JEE and NEET. Regular practice using the notes will ensure that the students grasp this chapter and the topics covered under it. The NCERT Solutions Class 12 Physics Chapter 15 are curated by the qualified professionals and experienced teachers to help students study and prepare for the exams effectively. 

NCERT Solutions Class 12 Physics Chapter 15 Communication System encompass the basic terminologies and elements of a Communication System. Topics like propagation of electromagnetic waves, Modulation, and bandwidth of signals are covered in chapter 15 NCERT solutions class 12 Physics. Students will also learn about the production and detection of Amplitude Modulated waves. The chapter is based on the different systems used to transmit, connect, communicate and interconnect. They are classified into three areas: Media, Technology, and Application. 

Extramarks helps students to learn more effectively with revolutionising methods. In addition, it provides interactive learning through the plethora of NCERT Solutions for various other classes. The experts  past years’ questions papers analysed by experts, sample papers, important concepts, and problems from the chapter before preparing the NCERT Solutions Class 12 Physics Chapter 15. 

In addition to NCERT Solutions Class 12 Physics Chapter 15, students can refer to study material for various other subjects. Students can also refer to other revision notes and NCERT Solutions from Class 1 to class 12 for all subjects at Extramarks for improving their academic performance.

Key Topics Covered In NCERT Solutions Class 12 Physics Chapter 15

The NCERT Solutions Class 12 Physics Chapter 15 will help students practise various objective questions, reasoning questions, and questions that need to be answered in brief from the chapter. Students who wish to pursue a career in engineering or medical science must ensure that they gain in-depth knowledge and understanding by using the NCERT Solutions provided by Extramarks. 

Before getting into the details, let’s glance through the list of topics included in this chapter:

Students may click on the respective topic to access the study material for NCERT Solutions Class 12 Physics Chapter 15. Furthermore, here is a brief of the various topics covered under Chapter 15 Physics.

15.1 Introduction

Ch 15 Physics class 12 introduces the concepts of the mode of communication, modulation, and production and detection of Amplitude Modulated Wave. In this chapter, students will study how electromagnetic waves propagate through the earth’s atmosphere and the functioning of the Communication Systems. This section of NCERT Solutions Class 12 Physics Chapter 15 gives a brief introduction to the contribution of scientists like J.C. Bose, F.B. Morse, G. Marconi, and Alexander Graham Bell in the history of communication. 

15.2 Elements Of A Communication System

This section in the NCERT solutions class 12 Physics chapter 15 Communication systems gives brief information about the three essential elements- transistor, channel, and receiver. Students also learn about the two modes of communication. 

15.3 Basic Terminology Used In Electronic Communication Systems

It is vital that students know the basic terminologies under Physics to earn the complex topics and principles of communication chapters. Under this section in the Class 12 Physics chapter 15 NCERT solutions, students will learn about the signal, information source, noise, and transmitter. In addition, the concepts of Transducer, attenuation, amplification, range, bandwidth, modulation and communication satellite are explained in detail. 

15.4 Bandwidth of Signals

This section of NCERT solutions class 12 Physics Chapter 15 includes information on the Bandwidth of Signals. Its SI Unit is given as hertz (Hz). This section also helps students learn the difference between digital signals and analogue signals. A detailed stepwise explanation of how the rectangular waves are decomposed into a superposition of sinusoidal (sin) waves of frequencies. There is a figure mentioned which illustrates this fact. 

The NCERT solutions class 12 Physics Chapter 15 aim to help students perceive each concept better. 

15.5 Bandwidth Of Transmission Medium

Students will clearly understand the different bandwidths offered by transmission media. The table mentioned in the NCERT solutions class 12 Physics Chapter 15 displays the wireless communication frequency bands. Students will also gain knowledge about the two types of transmission media. They are as follows.

1. Guided transmission medium: used in point to point and line communication. 
2. Unguided transmission medium: used in space and satellite communication.

15.6 Propagation Of Electromagnetic Waves

The concept of propagation of em waves in the atmosphere of the earth is explained in detail. It includes a brief discussion about some useful layers in the earth’s atmosphere. This section is further divided into three parts in the NCERT Solutions Class 12 Physics Chapter 15. First, it gives information about the different modes of propagation, such as Ground wave, Sky wave, and Space wave. Students can easily understand these topics with the help of diagrams and tables. 

15.7 Modulation And Its Necessity

With the help of this section, students will know what modulation is and why it is necessary. Students also learn some factors such as the size of the antenna or aerial, the effective power radiated by an antenna, and the mixing up of signals from different transmitters, which prevents from transmitting an electronic signal, and how to overcome them. Graphical representation and detailed explanation are included in the class 12 Physics NCERT solutions chapter 15 of sinusoidal carrier wave dependent on the signal strength, amplitude, angular frequency, and the initial phase is mentioned in this section. 

15.8 Amplitude Modulation

This section is based on the previous topic. In this section, students will understand the process of amplitude modulation using the sinusoidal modulating signal. The derivations are explained in detail in a stepwise manner. NCERT Solutions Class 12 Physics Chapter 15 includes various numerical problems based on the formulas derived in this section. 

It is represented by  Cm(t)=Ac [1+AmAcsin mt]sin ct, where AmAc= is the amplitude modulation index. 

Furthermore, the production and detection of Amplitude Modulated Wave are explained in sections 15.9 and 15.10. Students will also know about the intermediate frequency (IF) stage in this section. 

Students may access the study material for the topics mentioned under NCERT Solutions Class 12 Physics Chapter 15 by clicking on the respective topic in the table.

List of NCERT Solutions Class 12 Physics Chapter 15 Exercise & Answer Solutions

The communication system is considered to be an easy and scoring chapter. To help students study better and enhance their learning process, Extramarks provides the NCERT Solutions Class 12 Physics Chapter 15. Students can practise lots of questions using the sample papers, CBSE question papers, and other important study resources. These notes provide apt and authentic information so that students can retain knowledge for a longer time. 

Click on the link provided below to get access to the NCERT Solutions Class 12 Physics Chapter 15:

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NCERT Exemplar Class 12 Physics

The NCERT Exemplar notes help students to gain in-depth knowledge of all chapters included in the CBSE Physics syllabus. Students can practise important CBSE questions framed by professionals and expert teachers. For example, chapter 15 NCERT solutions class 12 Physics provides detailed analysis so that students can understand the chapter clearly. The solutions are well-planned and explained in a detailed manner using coloured illustrations, graphs, and diagrams wherever necessary. Students can also learn various tips, tricks, and short-cut methods to tackle complex questions in an easy and quick way. 

Key Features of NCERT Solutions Class 12 Physics Chapter 15

The key features of the NCERT Solutions Class 12 Physics Chapter 15 provided by Extramarks include

• A well-structured and organised set of solutions made by subject matter experts based on the analysis of the past years’  question papers.
• The class 12 Physics NCERT solutions chapter 15 is based on the latest guidelines issued by the Central Board of Secondary education (CBSE). 
• The notes include detailed and accurate solutions with precise reasoning to every question to ease the understanding of every student.  
• The NCERT Solutions Class 12 Physics Chapter 15 enables quick revision as it provides all important formulae, equations, and derivations. 
• It helps to develop and improve their problem-solving, logic, and analytical skills.