Sound class 9 notes

CBSE Class 9 Science Notes for the academic year 2023-2024 serve as a crucial foundation for students’ further education. To excel in exams, it is critical to fully comprehend each topic while also thoroughly revising the subject matter. As Class 9 is a crucial period for students, GeeksforGeeks provides precisely crafted revision notes to help students be productive and well-prepared for their CBSE Class 9 Science Exam. These science notes are compiled by subject specialists in science subjects and include extensive explanations for each topic covered in the NCERT Book’s chapters. The Class 9 science notes provide information on all of the relevant formulas, graphs, and equations, presented in an easy-to-understand language and manner. Class 9 Science Notes CBSE Class 9 Science chapter notes will help students secure good marks as well as an understanding of the fundamental concepts of CBSE Class 9 Science Syllabus. All required formulas, graphs, and equations are provided in the most concise manner possible for easier understanding. Check these Class 9th Science Notes to learn and revise all the important concepts and their explanations for each topic covered in all chapters quickly. These notes help students as revision notes for the coming board examination. CBSE Class 9 Science Notes – All Chapters List CBSE Class 9 Science Notes Chapters List Chapter 1 – Matter In Our Surroundings Chapter 9 – Force And Laws Of Motion Chapter 14 – Natural Resources Chapter 7 – Diversi...

Class 9 Science has conceptual chapters that prepare a strong foundation among the students. It will help them to identify their passion and continue to pursue it in the higher classes. The basic foundation related to science is very necessary at this stage. One of the crucial chapters to study in this syllabus is sound. It is the 12 th chapter in the subject that needs more attention from the students. They will learn how sound waves originate and how they propagate in a medium. This is the first time they will learn what an energy wave is and how it behaves in a medium. To make these new concepts clearer, the science teachers of Vedantu have created Class 9 Science Chapter 12 Sound notes to provide an easy medium to follow. They have used simple language to explain all these concepts. They are aware of the common doubts and difficulties students face during studying this chapter. Hence, Class 9 Ch 12 Science notes will be the best bet to follow and prepare the chapter accordingly. These CBSE Solutions notes can be downloaded and used offline at your convenience. There is no need to worry when you have the best notes to follow before an exam. You can also download Class 9 Maths NCERT Solutions to score more marks in your examinations. Important Topics Covered under Chapter 12 - Sound The following is a list of the important topics that are covered under Class 9 Science Chapter 12 - Sound. Students are advised to read these through so that they may have an idea of the conc...

Chapter Name Propagation of Sound Topics Covered • Production of Sound • Characteristics of Wave Motion • Speed of Sound in Different Media • Ultrasound and its Applications Related Study • • Production of Sound • When you strike a tuning fork, it starts vibrating. When this tuning fork is brought near the ear, we hear some sound. • When this fork is brought near a hanging ball, the ball starts oscillating. • Thus, a vibrating source is necessary for the production of sound. Sound Needs a Material Medium to Travel • Sound is a mechanical wave and needs a material medium to propagate. It cannot travel through vacuum. • The medium through which sound travels must have the following properties: 1. It should be elastic so that its particles return to their initial positions after displacement. 2. It should have inertia so that its particles have the capacity to store energy. 3. It should be frictionless so that there is no loss of energy in propagation of sound through it. Experiment to test the requirement of material medium • The hammer strikes the gong of the bell and sound is heard when the switch is pressed, that is, when the circuit is complete. • If air is present inside the jar, then we are able to hear the sound. However, if air is removed, then the sound is not audible. • The hammer is seen striking the gong, but the sound is not heard. Propagation of Sound in a Medium • The matter or substance through which sound is transmitted is called a medium. • When an object v...

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On this page, you will find Sound Class 9 Notes Science Chapter 12 Pdf free download. CBSE NCERT CBSE Class 9 Science Chapter 12 Notes Sound Sound Class 9 Notes Understanding the Lesson 1. Sound Sound is a form of energy which produces a sensation of hearing in our ears. 2. Production of sound Sound is produced by vibration of objects. • The sound of human voice is produced due to vibration in the vocal chord. 3. Propagation of sound Sound propagates in the form of longitudinal waves and these waves require material medium to propagate. Hence sound waves are mechanical waves. • A wave is a disturbance that moves through a medium when the particles of the medium set neighbouring particles into motion. • The longitudinal wave of sound travels in the form of compression and rarefaction. Compression is the region of high pressure and rarefaction is the region of low pressure. • The propagation of sound can be visualised as propagation of density variations or pressure variation in the medium. 4. Sound needs a medium to travel Sound is a mechanical wave and need a material medium for its propagation. • Longitudinal wave A wave in which the particles of the medium oscillate to and fro in the same direction in which the wave is moving is called longitudinal wave. • Transversal wave A wave motion is said to transverse if the particles of the medium through which the wave propagates vibrate in the direction perpendicular to the direction of propagation of the wave. 5. Some importan...

The NCERT chapter 12 Sound discusses the reason how organisms are able to hear in detail. The NCERT Class 9 Science Chapter 12 Notes covers a brief details of the chapter Sound-The main topics covered in Sound- class 9 notes are — production and propagation of sound, medium of sound, description of sound waves, determination of sound in different media, a reflection of sound, echo, reverberation, uses of multiple reflection of sound, hearing range and applications of ultrasound, sonar and structure of human ear. Table of contents Also, students can refer, • NCERT notes Class 9 Science • NCERT Solutions for Class 9 Science Chapter 10 Sound • NCERT Exemplar Class 9 Science Solutions chapter 10 Sound NCERT Class 9 Science Chapter 12 In our daily life , humans, birds, bells, machines etc produce sounds. Sound can be defined as a kind of energy that generates a sensation of hearing in our ears. The production of sound is aided by plucking, scratching, rubbing, blowing or shaking any object. Sound is produced by a vibrating body. Human beings produce sound by vibrations in the vocal cords. Propagation of Sound Medium is anything which is capable of transmitting a sound. A medium can be any solid, liquid or gas. Sound travels from it's point of generation to the listener via a medium. When an object vibrates it enables the medium particles to vibrate. They do not move from the vibrating object to the ear, instead, one particle comes in contact with the object and gets displaced f...