VR Tour For Std. 8 Ch. 13. Sound
What's Included in Virtual tour of this chapter
Vibration can be described as a back and forth motion of an object. Depending upon the vibrations, a sound is produced. The number of vibrations made by the vibrating body in one second is known as its frequency. Human beings produce sound by using the voice box inside their throat which is called the larynx. We will also explore that how sound can travel through a medium such as air, water, and solids but it can’t travel through a vacuum. Therefore, when these waves reach our ears we hear the sound.
Virtual tour 1: How sound produced
Sound is produced due to the vibration of an object. The to and fro, and, back and forth motion of an object is called vibration. Sound waves travel through a medium such as a solid, liquids, and gases. Different mediums lead us to hear loud, reduced, or garbled sounds. The SI unit of frequency is the hertz (Hz).
Virtual tour 2: The sound produced by human
Human beings produce sound by using the voice box which is called the larynx. The human voice box contains two ligaments known as vocal cords. Sound is produced by the vibrations of the vocal cords. The voice box has three important functions: To protect the airway from choking on the material in the throat, to regulate the flow of air into our lungs, and produce sounds used for speech.
Virtual tour 3: Propagation of Sound
Sound needs a material medium for its propagation like solid, liquid, or gas to travel because the molecules of solid, liquid, and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves. Sound waves travel the slowest through gases, faster through liquids, and through solids.
Virtual tour 4: The Ear structure and function
The ear is an advanced and very sensitive organ of the human body. The ear’s function is to transmit and transduce sound to the brain through the parts of the ear: the outer ear, the middle ear, and the inner ear.