What is called infrasonic sound? October 10, 2024July 14, 2020 by Author If the frequency of sound is less than 20 Hz it is called infrasonic sound. Related Posts:What is frequency?Ultrasound Images : about various ultrasound images…What is a sep ira and how does it work?Finance and Business FinanceWhat is called vibratory motion? Examples and ImportanceWhat is Bumble?