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Lec20 - The Nature of Sound Sound any audible vibration of...

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The Nature of Sound Sound - any audible vibration of molecules;they can be transmitted through liquids, solids and gases, but not sound will not travel in a vacuum.. Soundwaves are energy waves that are Sine waves ( have a crest and a trough ) One wavelength is from peak of crest to the peak of another crest.
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All about Pitch Pitch- is whether a sound is “high” or “low” and is based on the frequency of wavelength. Frequency is inversely proportionate to size of wavelength. Frequency is a function of frequency or directly proportionate to frequency. Q: Which figure on left, top or bottom, would have the have the higher sounding pitch?
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Properties of Sound Ear detects pressure waves Amplitude of waves corresponds to perceived loudness Frequency of waves (number per second) corresponds to perceived pitch
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Pitch and Loudness Pitch - frequency vibrates specific parts of ear hearing range is 20 (low pitch) - 20,000 Hz (cycles/sec ) speech is 1500-4000 where hearing is most sensitive Loudness – amplitude ; intensity of sound energy
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Fooled The Teacher Again Beyond a certain age around 17 or so, most people cannot hear sounds higher than 13 KHz (13,000 Hz). There is a set of frequencies (around 15 kHz) an astute teen set his cell phone ringer to so his teacher would hear it.
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Classification of Receptors By modality: chemo-, thermo-, mechano-, photo- receptors and nociceptors By origin of stimuli interoceptors - detect internal stimuli proprioceptors - sense body position and movements exteroceptors - detect external stimuli By distribution general senses - widely distributed special senses - limited to head
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Balance and Equilibrium In humans, organs of equilibrium are located in the inner ear Vestibular apparatus
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The Ear Houses two senses Hearing Equilibrium (balance) Receptors are mechanoreceptors
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Mechanoreceptor is a Sensory Receptor WHICH IS… Sensory Receptors - Take sensory information from the environment ; it is transduced into nerve impulses in the CNS. The Ear is an organ that contains mechanoreceptors, receptors that can detect sound waves and the transducer.
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