Topic 63 of 120 in the MU Plovdiv syllabus for Hygiene and Ecology (Medicine, Year 3). The free AceMed note covers it in 1 section, about 29 words (1 min of reading), with 15 flashcards.
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Noise, ultrasound and infrasound in production, industrial vibrations – hygienic characteristics, biological effects, prevention.
Noise, ultrasound and infrasound in production, industrial vibrations – hygienic characteristics, biological effects, prevention.
Humans can hear sounds in the frequency range of 20 Hz to 20 kHz.
Sounds below 20 Hz are called infrasound, and sounds above 20 kHz are called ultrasound.
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