# NCERT Solutions for Class 9 Science Chapter 12 Sound

NCERT Solutions for Class 9 Science Chapter 12 Sound: Every day we hear different veracity of sounds. Do you know how these sounds are produced? Sound is produced due to the vibration of object and the vibration is transferred to nearby matters in the medium and it is transferred by successive compression rarefaction and compression and finally, it reaches our ear. The necessary condition for sound to travel is it requires a medium. Sound cannot travel in the vacuum. The speed of sound, wavelength and frequency is related as $v=\nu \lambda\ where\ v\ is\ the\ velocity\ \nu\ is\ frequency\ and\ \lambda\ is\ the \ wavelength$. The pitch of a sound is determined by its frequency and loudness is determined by the amplitude.

In the above figure, A represents the amplitude of the sound wave. Sound propagates as density or pressure variations.

Here are the important Topics of NCERT Class 9 Science Chapter 12 - Sound mentioned below:

12.1 Production of Sound

12.2 Propagation of Sound

12.2.1 Sound Needs a Medium to Travel

12.2.2 Sound Waves are  Longitudinal Waves

12.2.3 Characteristics of  a Sound Wave

12.3 Reflection of Sound

12.3.1 Echo

12.3.2 Reverberation

12.3.3 Uses of Multiple Reflection of Sound

12.4 Range of Hearing

12.5 Applications of Ultrasound

12.5.1 Sonar

12.6 Structure of Human Ear

After going through this chapter, you must be able to get the NCERT Solution of these questions which are mentioned below, as these questions are from NCERT.

1. Describe with the help of a diagram, how compressions and rarefactions are produced in the air near a source of the sound?

If you have any problem in answering these questions or you are not getting the correct answers then don't worry, NCERT Solutions for Class 9 Science Chapter 12 Sound is there for you to help. NCERT Solutions for Class 9  will give you answers to all the questions which are mentioned in the NCERT book.

First of all, try to answer all the questions by yourself. Then, if you need any help, NCERT Solutions for Class 9 Science Chapter 12  Sound will suggest you the best answer written by our experts.

## NCERT Solutions for Class 9 Science- Chapter Wise

 Chapter No. Chapter Name Chapter 1 Matter in Our Surroundings Chapter 2 Is Matter Around Us Pure Chapter 3 Atoms and Molecules Chapter 4 Structure of The Atom Chapter 5 The Fundamental Unit of Life Chapter 6 Tissues Chapter 7 Diversity in Living Organisms Chapter 8 Motion Chapter 9 Force and Laws of Motion Chapter 10 Gravitation Chapter 11 Work and Energy Chapter 12 Sound Chapter 13 Why Do We Fall ill? Chapter 14 Natural Resources Chapter 15 Improvement in Food Resources