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seismic tomography
tsunami forecast
crystal detector
storm surge
geoduck (Panopea generosa)
microwave background (radiation)
cosmic microwave background radiation
different frequency; inter-frequency
ultrasonic microscope; acoustic microscope
ultrasonic motor
Physics
Alfven wave; Alfvén wave; type of magnetohydrodynamic wave
frequency-changer station; frequency converter station
ultrasonic generator; sonicator
Grateloupia elliptica (species of red alga)
radio frequency; RF
freak wave; rogue wave
rogue wave; freak wave
(radio) channel occupancy
ultrasonication; sonication; ultrasonic treatment
bridge-type full-wave rectifier
terrestrial digital broadcasting; digital terrestrial television
tilde
low-frequency noise pollution; low-frequency pollution
radio-frequency engineering