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What is a Class 8 science sound note?
What is Sound Chapter 8 notes?
What is CBSE Class 8 Science Ch 13 notes?
What is voice box in CBSE Class 8 Science notes Chapter 13?
Introduction to Sound. Introduction to waves. The sound is produced by vibrating objects. They travel from one place to another in the form of waves. Hence, the name sound waves. Wave and particle motion of waves. Mechanical waves are waves that travel through a material medium.
Jan 24, 2024 · CBSE Class 8 Science Notes Chapter 13 Sound Pdf free download is part of Class 8 Science Notes for Quick Revision. Here we have given NCERT Class 8 Science Notes Chapter 13 Sound.
- What Is sound?
- How Do Humans Produce sound?
- How Sound Travels in A Medium?
- How Do We Hear?
- How Loudness and Pitch Are Different from Each other?
- Noise and Music
A sound is a form of energy that is produced when air molecules vibrate in a particular pattern called waves. Hence, the sound is a wave.Vibration can be described as a back and forth motion of an object.Depending upon the vibrations, a sound is produced. Sound cannot be produced without any vibration.Human beings have a voice box or larynx which is present in their throat on the upper side of the windpipe.The larynx has two vocal cords which have a narrow slit between them so that air can pass through it.As the lungs throw the air out of the windpipe, it passes through the slit and hence allows the production of sound as the vocal cords start vibrating.The vocal cord muscles also play a role in the production of sound.Sound needs some vibration of molecules to travel.Solids, liquids and gases all have molecules present in them which allow the propagation of sound.These molecules or particles in solids, liquids and gases are packed in varied ways.Solids have tightly packed particles in them and hence they allow fast propagation of sound through them as the vibrations can be carried easily from one particle to another.We know that sounds are produced as waves in the air or any other medium.As these sound waves travel to our ears they convert them into electrical signals or messages that our brain can understand.Our ears have a special structure that allows this function.There are three major parts of the human ear:Audible and Inaudible sounds
1. Sounds that can be heard by human ears are called audible sounds. The range of audible sounds is from 20 Hz to 20 KHz. 2. Sounds that cannot be heard by human ears are called inaudible sound. Any sounds having a frequency less than 20 Hz or greater than 20 KHz are categorized as inaudible sounds. Figure 15 Loudness of Sound from various Sources The inaudible sounds can be divided into two categories as infrasound and ultrasound. Figure 16 Infrasound and Ultrasound
Noise can be regarded as an unpleasant sound. Noise consists of sound waves of varied frequencies which have no particular periodic pattern of repetition. Therefore, noise is regarded as a mixture...Music, on the other hand, is a pleasant sound that has a clear pitch. Musical sound can be created by arranging and combining different sounds in a particular order. The frequencies of a musical so...These Sound Class 8 notes, explanations, examples, and questions and answers are according to CBSE and the NCERT textbook. If you like the study material, feel free to share the link as much as possible.
Oct 4, 2019 · NCERT Solutions for Class 8 Science Chapter 13 – 2 Mark Questions and Answers Question 1. The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second.
Feb 9, 2019 · Sound Class 8 Science Chapter 13 as per NCERT Book used in CBSE and other Schools. The lesson covers the complete explanation of class 8 Chapter 13 Sound. Topics covered are sound, types of sound, sound as wave and wave types.
4 days ago · CBSE Class 8 Science Ch 13 Notes briefs students on all the essential topics that highlight the importance and the role of sound in our everyday life. The Class 8 Science Chapter 13 Sound Notes by Vedantu help students comprehend the concepts under the chapter.
