NCERT Grade 9 CBSE belongs to the Unit III Motion, Force and Work. This chapter describes about the Production of Sound, Propagation of Sound. The topic propagation of sound further includes sound needs a medium to travel, sound waves are longitudinal waves, characteristics of a sound wave, speed of sound in different media. All these topics are explained with the help of practical activities, diagrams, out of the box information, and in between exercises. The solutions given for the problems in this chapter will help the students to become aware of the basic concept of production and propagation of sound and many more interesting things that we use and see in our day to day life related to them.
In this chapter, students will get hold about the Reflection of Sound ECHO, reverberation, uses of multiple reflection of sound.All of these concepts have been taught with the help of activities to be done in the Physics laboratory, thus making the learning process more interactive. The solutions to the problems pertaining to the problems in between the chapters further help the students to understand their level of learning.Interesting topics such as Range of Hearing, Applications of Ultrasound will be learnt in this chapter with the help of activities. Besides, activities wonderful phenomenon about SONAR will further help the students to learn about the concept.
In this chapter, Sound, students will also learn more about Structure of Human Ear.Students are advised to go through the solutions provided in these topics for conceptual learning and scoring well in the exams. The NCERT Solutions for class 9 Science provided herein are designed by our subject matter experts in a simple and precise manner.This chapter is a part of Unit III Motion, Force and Work of NCERT Grade 9 Science CBSE. This Unit holds a weightage of 27 marks in the annual examination. Get 100 percent accurate NCERT Solutions for Class 9 Science Chapter 12 (Sound) explained by expert Science teachers. We provide solutions for the questions given in Class 9 Science textbook as per CBSE Board guidelines from the latest NCERT book for Class 9 Science. The topics and sub-topics in Chapter 12 Sound are given below.
Ex 12.1 - Production of Sound
Ex 12.2 - Propagation of Sound
Ex 12.2.1 - SOUND NEEDS A MEDIUM TO TRAVEL
Ex 12.2.2 - SOUND WAVES ARE LONGITUDINAL WAVES
Ex 12.2.3 - CHARACTERISTICS OF A SOUND WAVE
Ex 12.2.4 - SPEED OF SOUND IN DIFFERENT MEDIA
Ex 12.3 - Reflection of Sound
Ex 12.3.1 - ECHO
Ex 12.3.2 - REVERBERATION
Ex 12.3.3 - USES OF MULTIPLE REFLECTION OF SOUND
Ex 12.4 - Range of Hearing
Ex 12.5 - Applications of Ultrasound
Ex 12.5.1 - SONAR
Ex 12.6 - Structure of Human Ear.
We cover all exercises in the chapter given below:-
EXERCISE 12.1 - 1 Question with Solution
EXERCISE 12.2 - 3 Questions with Solutions
EXERCISE 12.3 - 2 Questions with Solutions
EXERCISE 12.4 - 4 Questions with Solutions
EXERCISE 12.5 - 1 Question with Solution
EXERCISE 12.6 - 1 Question with Solution
EXERCISE 12.7 - 1 Question with Solution
EXERCISE 12.8 - 1 Question with Solution
EXERCISE 12.9 - 2 Questions with Solutions
EXERCISE 12.10 - 1 Question with Solution
EXERCISE 12.11 - 22 Questions with Solutions
Other than given exercises, you should also practice all the solved examples given in the book to clear your concepts on Sound. Download the free PDF of Chapter 12 Sound and take the print out to keep it handy for your exam preparation.