What differentiates the five unvoiced fricatives |f| , |t| , |s| , |s| , |h| ? why are fricatives lower in energy than vowels?
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The fricatives are lower in energy than vowels due to airflow and the speed spoken. The nasal forces the sound to sound lower within the five unvoiced fricatives f, t, s, s, and h. The glides sweeping down also places a significant part in this determination.
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Fricatives are produced by a partial obstruction of the vocal tract so that the air which comes through it becomes turbulent. The continuing nature of their turbulent energy which generally lasts 100 ms or more, distinguishes them from other manners of articulation.
Fricatives can be either voiced or voiceless. They are lower in energy than vowels because of lower air flow. 'h' possesses a low frequency due to resonation of the entire vocal tract above the glottis. 'f' has weak noise energy because there is no resonating tube.
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