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Accommodation and its importance
Anatomy and function of the human ear
Anatomy and Function of the Human eye
Detection of vibrations
Distribution of hair cells and the detection of sounds
Distribution, structure and function of the photoreceptor cells
Myopia and Hyperopia
Path of a sound wave
Production of sound
Range in electromagnetic radiation
Refraction of light
Refractive power of the lens
Rhodopsin in rods
Sound as a form of communication
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Production of sound
explain that sound is produced by vibrating objects and that the frequency of the sound is the same as the frequency of the vibration of the source of the sound.
Sound is produced by vibrations of a stimuli, the vibrations of the stimuli cause vibration within the air particles around it. The frequency of sound produced by a stimuli remains at a constant frequency until it reaches the ear and enters the ear at that same frequency. i.e. the vibrations produces by the stimuli are the same as the vibrations travelling through the air and the vibrations heard within the ear. e.g. If a tuning fork vibrates at 256Hz it sets the air particles through which it is travelling at 256Hz also, the vibrations are then heard by the ear at 256Hz.
Figure 15.1 represents the constant frequency of sound as it travels. If this image were extended in both directions it would represent a sound wave and the frequency of the wave would always remain the same.
2007), Ron Kurtus (revised 7 December. "Beat Frequencies in Sound - Succeed in Understanding Physics: School for Champions."
School for Champions: online lessons for those seeking success
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Aubusson, Eileen Kennedy Peter.
Biology in Context: the Spectrum of Life
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NSW HSC Online
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