We can’t hear all levels of sounds. Sound waves with very high frequencies are called ultrasound and our ears can’t detect them. Ultrasound waves have multiple uses including: detecting ...

When two tones of slightly different frequencies are played in separate ears simultaneously (usually through headphones), the human brain perceives ... corresponding brain wave: Beta waves ...

Ultrasound refers to sound waves with frequencies above the range of human hearing, or 20 kHz. These waves travel through the air like normal sound waves but are inaudible to people. Because ...

To sidestep that issue, the researchers use two beams of ultrasound waves — the type used in medical imaging — which vibrate at a frequency way above human hearing as a "carrier for audible ...

Home > Press release: Brain waves in harmony: when neurons ...

Blinking at a rate of 1 billion times per second, or 1 GHz, is not possible for a human being ... the use of electromagnetic waves in the terahertz (1 THz = 1012 Hz) region of the electromagnetic ...

This class focuses on the role of waves in human body systems through student-directed inquiry ... Key concepts covered include sound waves, hearing, wavelength, frequency, amplitude and heart rate.

The seismic waves' frequencies determine, in part, how far they travel and how damaging they are to human-made structures. However, the inaccessibility of fault zones means that very little is known ...