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Sound Sound Presentation Transcript

  • Observations | Questions | Discussion| Key Concepts
  • Mara Cabrera Dang DavidJovelle Delos Reyes Zonasha MusaKristabelle Ocampo Chinina Perez Ana Reyes Armida Reyes Agatha Sayurin
  •  Distance affects frequency Sound waves travel faster in solid Patterns are formed from the sounds made Solid is a better resonator than liquid The longer the tuning fork is, the lower the tone it produces Chirping of birds and buzzing of bees differ from volume/tone but they have alike patterns
  •  How is sound formed? How do we perceive sound? How does sound travels? Does the frequency of sound decrease over distance? Why does sound has a higher frequency in solid than in liquid? Does the universe resonate sound waves?
  • How is sound formed?• Sound waves are produced by vibrations of an object• Vibration – to and fro motion of an object.•Source of sound is always a vibrating body.
  • Sound is transmitted through material media inpressure waves made up of alternate compression andrarefactions. Compression (forcing of Rarefactions (pulling of the molecules of the the molecules of the medium together) medium away from one another).
  • How do we perceive sound?We perceive sounds through our ears.E A R - sound detector -can detect sound waves over a wide range of frequencies
  • • Sound waves that enter the ear cause the ear drums to vibrate.• These vibrations are passed on by three tiny ear bones (hammer, anvil & stirrup)• To the cochlea where they are detected by tiny hair cells.• These hair cells then send signals to the brain through the auditory nerve, producing the sensation of sound.
  • How does sound travels?1. Sound is transmitted by particles in a solid, liquid or gascolliding with each other. It is a wave which is created byvibrating objects.2. Sound vibrations, then, travel outwards in alldirections in waves from a sound source. As they traveloutwards the energy they contain becomes dissipated andtherefore the sound becomes weaker the further it is fromthe source.3. Eventually the sound reaches the ear and is made intosignals which are sent to the brain.
  • Why does sound has a higherfrequency in solid than in liquid?The molecules in soild are more tightly bound togetherthan that of solid
  • Hence, it is easier for sound waves to go through solids than liquids. From that we can say that the closer the moleculesare to each other and the tighter their bonds, the lesstime it takes for them to pass the sound to each other and the faster sound can travel.
  • Does the universe resonate soundwaves?“The universe is not a silent movie. The universeisnt silent. Id like to convince you that theuniverse has a soundtrack and that soundtrack isplayed on itself because space can wobble like adrum. It can ring out a recording of some of themost dramatic events as they unfold.” –Janna Levin
  • KEY CONCEPTS  Without vibration, there is no sound.  We perceive sound through our ears. Sound travels through matter as a waveform. The speed of sound depends on its medium or resonator.  Our universe creates sound too. Sound is significant to our lives.
  • REFERENCES:Padua, A. & Crisostomo, R (2010). Science and Technology Series Practical and Explorational Physics:Modular Approach 2nd Edition Quezon City: Vibal Publishing House, Inc.http://www.tellmewhyfacts.com/2007/09/how-does-sound-travel.htmlhttp://www.huffingtonpost.com/2011/03/01/janna-levin-at-ted-2011_n_829746.htmlhttp://www.ndted.org/EducationResources/HighSchool/Sound/speedinmaterials.htm