Children under the age of five can hear frequencies up to 25 kHz, whereas adults typically cannot hear frequencies this high, as their ears become less sensitive to higher frequencies with age.
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The audible range of sound frequencies for human beings extends from about 20 Hz to 20,000 Hz.
Examples of sound-absorbent materials used in auditoriums include compressed fibreboard, rough plaster, draperies, and specially selected seat materials that absorb sound effectively.
Sound-absorbent materials help in reducing reverberation by absorbing sound waves instead of reflecting them, thereby reducing the persistence and overlap of sound.
compressed fibreboard, rough plaster, draperies, and seat materials designed for their sound-absorbing properties.