SCIENCE GRADE 8 QUARTER ONE- SOUND - PPT
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Sound waves are produced by the vibration of molecules and transmitted through matter as longitudinal waves, traveling faster in solids than liquids or gases due to the closer proximity of molecules. Sound travels as waves that can be reflected, refracted, or absorbed by various media; the velocity depends on the density and elasticity of the material. The human ear detects sound waves through the vibration of the eardrum and conversion to neural signals by specialized structures in the inner ear that are transmitted to the brain for interpretation.Sound
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Sound is produced by vibrations that propagate as waves through a medium such as air or water. When an object vibrates, it causes the surrounding air or medium to also vibrate, producing sound waves. These waves travel outward in all directions from the source. Humans and many animals can produce sound vocally using specialized organs like vocal cords. Musical instruments also produce sound through various vibration-based mechanisms like plucking strings, blowing air through an opening, or striking a membrane or object. The perception of sound depends on factors like frequency, wavelength, amplitude and speed of propagation through a medium.Sound 130822001856-phpapp01
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Sound propagation refers to the way sound waves travel through a medium such as air, water, or solid materials. Sound is a mechanical wave, meaning it requires a medium to move. The process can be summarized in the following steps:
Vibration Source: Sound begins when an object vibrates. This vibration disturbs nearby particles in the medium.
Particle Interaction: The vibrations cause particles to compress (come closer) and rarefy (spread apart) in a repeating pattern, forming longitudinal waves.
Wave Travel: The energy of the sound wave moves outward from the source as these compressions and rarefactions propagate through the medium.
Medium Type: The speed and quality of sound propagation depend on the type of medium. Sound travels fastest in solids due to tightly packed particles, slower in liquids, and slowest in gases like air.
Factors Affecting Speed:
Density: Sound travels faster in denser media (e.g., metal vs. air).
Temperature: Higher temperatures increase the speed of sound as particles move more quickly.
Elasticity: More elastic materials (e.g., steel) transmit sound faster than less elastic ones.
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The document discusses how sound travels and is heard. It explains that sound requires a medium, such as solids, liquids, or gases, to propagate. It travels fastest in solids and slowest in gases. The ear drum vibrates when sound enters the ear, transmitting the vibrations to three small bones and then to the cochlea, which converts it into electrical signals sent to the brain, allowing us to hear.Directional speaker
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1) Sound is produced by vibrations that create longitudinal waves which propagate through a medium and are detected by the human ear. The vibration of matter sets the air molecules in motion which transfers energy.
2) Factors like the thickness, length, and tension of the material producing the vibration determine the pitch and loudness of the sound. A thinner, shorter, or more tense material will produce a higher pitch sound.
3) The outer, middle, and inner ear work together to detect sounds. The outer ear collects sound waves which set the eardrum vibrating, transmitting the vibrations through a series of small bones to the cochlea where they are converted to nerve impulses sent to theSound
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1) Sound is produced by vibrations that create longitudinal waves which propagate through a medium and are detected by the human ear. The vibration of matter sets the air molecules in motion which transfers energy.
2) Factors like the pitch and loudness of sound depend on characteristics of the propagating medium and vibrations. Pitch corresponds to frequency of vibrations and loudness depends on amplitude.
3) The human ear detects sound waves and converts them to electrical signals through a series of parts - the outer, middle and inner ear. The cochlea converts vibrations to neural signals sent to the brain for interpretation.
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Sound is a mechanical wave that travels through air or other media and can be heard. It is created by vibrations between 20-20,000 Hz. Sound waves are longitudinal waves that cause compressions and rarefactions in the transmission medium. The speed of sound depends on factors like the medium and temperature, and in air at standard temperature and pressure it travels at 332 m/s. Sound finds many applications in medicine like ultrasound above 20 kHz used for sonograms and cancer treatment.New microsoft office power point presentation (3)
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Sound is a vibration that travels in waves through a medium like air or water. It is caused by vibrating objects and radiates outward in all directions. When these vibrations reach the ear, they are interpreted by the brain as sound. Sound waves are longitudinal waves that cause alternating compressions and rarefactions in the medium as they propagate. For sound to travel, it requires a material medium like air, water or other solids and liquids. As sound waves travel, they can be reflected, refracted or attenuated by the medium. The human ear collects sound pressure waves which are amplified through the middle and inner ear where fluid-filled chambers containing hair cells detect vibrations and transmit nerve signals to the brain.Sound Class 9 Science Study Material pdf
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Introduction to Sound for Class 9 Science:
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The human ear has three main parts - the outer, middle, and inner ear. Sound waves enter the outer ear and cause the eardrum to vibrate. These vibrations are amplified by the three smallest bones in the human body in the middle ear. They transmit the vibrations to the inner ear, where fluid in the cochlea sets up electrical signals in auditory nerves that travel to the brain. The brain then interprets these signals as sound.Introduction course to Ultrasound Vascular Access 
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1. The document discusses Heinrich Hertz's experiments with sound and how it is produced through vibration and propagates as longitudinal waves through a medium like air.
2. Key experiments shown include using a vibrating tuning fork to produce compressions and rarefactions in air, demonstrating that sound needs a material medium to travel, and that the speed of sound depends on the medium and temperature.
3. Applications of sound reflection, resonance, infrasound, ultrasound, and SONAR are also summarized.
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PMO’s within an organisation can be centralised, hub and spoke with a central PMO with satellite PMOs globally, or embedded within projects. The appropriate structure will be determined by the specific business needs of the organisation. The PMO sits above PM delivery and the supply chain delivery teams.
For further information about the event please click here.QuickBooks Desktop to QuickBooks Online How to Make the Move
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* When is the best time to make the shift to QuickBooks Online?
* Will my current version of QuickBooks Desktop stop working?
* I have a really old version of QuickBooks. What should I do?
* I run my payroll in QuickBooks Desktop now. How is that affected?
*Does it bring over all my historical data? Are there things that don't come over?
* What are the main differences between QuickBooks Desktop and QuickBooks Online?
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SCIENCE GRADE 8 QUARTER ONE- SOUND - PPT
- 2. What is a vibration produced by a vibrating body?
- 3. You may decode the term by dialing the numbers 76863, in the keypad above. 1 ABC 2 DEF 3 GHI 4 JKL 5 MNO 6 PQRS 7 TUV 8 WXYZ 9 0
- 5. Sound Propagation Sound consists of waves of air particles. Generally, sound propagates and travels through air. It can also be propagated through other media. Since it needs a medium to propagate, it is considered a mechanical wave. In propagating sound, the waves are characterized as longitudinal waves. These are waves that travel parallel to the motion of the particles.
- 6. Misconceptions 1. Sounds can be produced without using any material objects. 2. Hitting an object harder changes the pitch of the sound produced. 3. Sounds can travel through empty space (a vacuum). 4. Sounds cannot travel through liquids and solids. 5. Sound travels slower in less dense medium. 6. The greater the density of the medium the faster the sound is transmitted.