david fee studies sound waves so deep and low that humans cannot hear them. what are these low frequencies…

david fee studies sound waves so deep and low that humans cannot hear them. what are these low frequencies called?\ninfrared\nseismology\ngeosound\ninfrasound
Answer
Brief Explanations:
Infrared is related to light, not sound. Seismology is the study of earthquakes. Geosound is not a standard term for low - frequency sound. Infrasound refers to sound waves with frequencies below the human - audible range.
Answer:
D. infrasound