Related by context. Frequent words. (Click for all words.) 60 hydrophone 57 infrasound 56 tuning forks 56 oscillatory 55 birdcalls 54 doppler 54 vibrating 53 underwater microphones 53 hydrophones 53 infrared beam 53 vocalisations 52 ultrasonic waves 52 pulsations 52 whirrs 52 ultrasonic 51 directivity 51 amplitudes 51 kilohertz 50 flapping wings 49 microelectrodes 49 katydids 49 vibrational 49 electroencephalography EEG 49 ultrasonics 49 whooshes 49 oscillations 49 geophone 49 millivolts 49 omnidirectional 49 erupting volcanoes 49 electro magnetic 49 electromagnetic pulses 48 vocalizations 48 disembodied voices 48 resonators 48 vibrates 48 beeps 48 pattering 48 vibrations 48 microwave radiation 48 airflows 48 howler monkeys 48 rustling leaves 48 seismometer 47 electromagnetic 47 echolocation 47 Cosmic rays 47 magnetic pulses 47 audible 47 wavelets 47 toadfish 47 frequency 47 ultraviolet wavelengths 47 stereophonic 47 interferometric 47 ganglion cells 47 whirs 47 modulated 47 foghorns 47 auroral 47 dipole 47 toroidal 47 ionospheric 46 crickets chirping 46 interplanetary spacecraft 46 pulsed 46 electromagnetic induction 46 Tesla coil 46 whooshing 46 tinkles 46 Pulsating 46 microwatts 46 binaural 46 bone conduction 46 tropospheric 46 electromagnetic EM 46 digital readout 46 voltmeter 46 skin conductance 46 whooshing sound 46 vibrate 46 narwhals 46 resonant frequency 46 dipoles 46 blowholes 45 temperature gradient 45 tuning fork 45 Doppler ultrasound 45 emitted 45 beep 45 ear shattering 45 intensities 45 electrical currents 45 infrared 45 zebra finches 45 beam splitter 45 undersea earthquakes 45 laser beams 45 vibration 45 seismographic 45 magnetic fields