Grade 11 - 3rd Trimester - 05 - Sound Waves.pptx

Grade 11 - 3rd Trimester - 05 - Sound Waves.pptx - SOUND...

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SOUND WAVES PRODUCTION, PROPAGATION, PERCEPTION
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PRODUCTION OF SOUND WAVES Any vibrating object can produce sound Vibration causes pressure variations in the medium
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HUMAN VOICE Vocal cords in the larynx vibrate and produce sounds Tension in the vocal cords changes the frequency of the sound produced
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PROPAGATION OF SOUND WAVES Sound waves are longitudinal waves Sound waves require a medium to travel through Sound waves travel more efficiently in denser medium
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PERCEPTION OF SOUND WAVES Humans detect sound through the ears
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PERCEPTION OF SOUND WAVES When sound waves enter the ear, the eardrums vibrate Ear ossicles (hammer, anvil, stirrup) passes the vibrations to the cochlea Hair Cells in the cochlea detect the vibrations and send signals to the brain
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PERCEPTION OF SOUND WAVES Pitch Loudness Timbre
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PITCH highness or lowness of a sound Higher frequencies result to higher pitch
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AUDIO FREQUENCY RANGE Range of frequency that humans can detect 20 Hz to 20 kHz
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