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Reflection and Absorption

Explore the fascinating concepts of sound waves, including reflection, absorption, and the phenomenon of echoes. Sound waves can bounce off surfaces, with some energy disappearing due to absorption, converting into heat. An echo is a reflected sound wave that creates an auditory copy of the original sound. Learn about echolocation used by animals like whales and dolphins, and the Doppler effect that explains how the pitch of sound changes as a source approaches or moves away. Discover the fundamental frequency and resonance that define the unique quality of sound.

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Reflection and Absorption

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Presentation Transcript

  1. Reflection and Absorption F 66-72

  2. Do sounds bounce? • Reflection the bouncing of a sound wave off a surface • Some of the wave’s energy enters the surface and some of the sound will disappear • This disappearance is called absorption • When a sound wave is absorbed its energy is changed into heat energy

  3. What is an Echo? • Echo a reflected sound wave • Made when a sound wave hits a surface and the sound is reflected back to the listener • Echolocation a form of sonar used by some animals (ex. Whales and dolphins) the sound waves bounce off of objects and the animals can tell how far away from a given object they are

  4. An echo is a copy of the original sound; both the original sound and the echo will have the same pitch

  5. Approaching Sound As a siren approaches, there are more sound waves reaching your ear each second than if the police car were standing still • The frequency increases and the pitch is higher

  6. Departing Sound • As the siren moves away, the sound waves spread out • The frequency decreases and the pitch is lower

  7. Change in Frequency • Doppler effect the change in frequency (and pitch) as a source of sound moves toward or away from you • Many radar devices use this effect to find the speed of an object

  8. What is Fundamental Frequency? • Quality sound is what makes it different from another sound of the same loudness and pitch • makes the sound unique • Fundamental Frequency the lowest frequency at which something will vibrate • Overtones sections of vibrating at higher frequencies each with a different pitch • It is F.F. and O.T. that give a sound its own quality

  9. Resonance • The natural frequency of a vibration • If a vibrating force shakes from natural frequency, the vibration builds up • Can make a trumpet or violin louder • Can cause damage to buildings and bridges

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