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Sound Waves

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L.A. Decimbrada
L.A. Decimbrada

Sound is produced by a vibrating object and transmitted through a medium like air as a mechanical wave. Humans produce sound through vocal cords in the larynx vibrating when air passes through from the lungs. The best medium for transmitting sound is a solid because its compact molecules transmit vibrations more efficiently than liquids or gases. The speed of sound increases with temperature, and phenomena like the Doppler effect and shock waves occur when the source of sound is in motion relative to the observer.

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SOUND WAVES: A MECHANICAL WAVE
Sound Waves
Sound Waves
• A sound is produced by a vibrating matter • A sound reaches our ears by sound waves through a transmitting medium, the air, entering to our ear. • A medium is a means to carry sound. • The air molecules transmit the sound energy by vibrating it at their positions. How sound is produced? How sound is perceived by humans?
How humans perceive sound?
How humans produce sound? • Humans produce sound through vocal cords, a narrow opening found at the larynx. • When air coming from the lungs passes through this opening while you speak, the vocal cords vibrate.
Sound Waves
Medium of Sound Waves •Solid •Liquid •Gas Which is the best transmitter of sound? Solid is the best transmitter of sound because of their compacted molecules are very much closer with each other rather than liquid and gases.
Speed of Sound At 0ºC, sound travels at about a speed of 332 m/s in air. As the temperature rises, the speed of sound increases at the rate of about 0.6 m/s for everyone Celsius degree rise in temperature.
Doppler Effect •a phenomenon when the source of sound approaches you, you hear a sound with a high pitch; thus, when the source of sound passes you by, the pitch becomes lower.
Sound Waves
Shock Wave •is when the speed of sound source is greater than the speed of sound waves, the crests piled up on one another, forming an extreme edge of cone.
Sound Waves
Types of Shock Waves •Subsonic (less than Mach 1) •Transonic (Mach 1) •Supersonic (Mach 2-5) •Hypersonic (Mach 5 & above)
Types of Sound Waves •Longitudinal waves •Transverse waves •Standing waves
Sound Waves
Sound Waves
Sound Waves
Sound Waves
Properties of Sound Waves •Reflection •Refraction •Diffraction •Interference
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Sound Waves
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Sound Waves

  • 4. • A sound is produced by a vibrating matter • A sound reaches our ears by sound waves through a transmitting medium, the air, entering to our ear. • A medium is a means to carry sound. • The air molecules transmit the sound energy by vibrating it at their positions. How sound is produced? How sound is perceived by humans?
  • 6. How humans produce sound? • Humans produce sound through vocal cords, a narrow opening found at the larynx. • When air coming from the lungs passes through this opening while you speak, the vocal cords vibrate.
  • 8. Medium of Sound Waves •Solid •Liquid •Gas Which is the best transmitter of sound? Solid is the best transmitter of sound because of their compacted molecules are very much closer with each other rather than liquid and gases.
  • 9. Speed of Sound At 0ºC, sound travels at about a speed of 332 m/s in air. As the temperature rises, the speed of sound increases at the rate of about 0.6 m/s for everyone Celsius degree rise in temperature.
  • 10. Doppler Effect •a phenomenon when the source of sound approaches you, you hear a sound with a high pitch; thus, when the source of sound passes you by, the pitch becomes lower.
  • 12. Shock Wave •is when the speed of sound source is greater than the speed of sound waves, the crests piled up on one another, forming an extreme edge of cone.
  • 14. Types of Shock Waves •Subsonic (less than Mach 1) •Transonic (Mach 1) •Supersonic (Mach 2-5) •Hypersonic (Mach 5 & above)
  • 15. Types of Sound Waves •Longitudinal waves •Transverse waves •Standing waves