Noise-canceling headphones can cause dizziness, headaches, and ear pressure. Here's why some users experience these strange ...

Most sound waves generated by aircraft are reflected ... But the challenge of detecting high-altitude targets in deep water was widely regarded as insurmountable. The research team, led by Zhang ...

Any sound above 20 000 Hz is called ultrasound. It is too high pitched for humans to hear, but other animals (such as dogs, cats, dolphins and bats) can hear ultrasound. Ultrasound waves are ...

The TRANSMISSION of acoustic energy through a medium via a SOUND WAVE. See: SOUND, SPEED OF SOUND ... It should be noted, however, it can be as high as 5 dB/100 m at 8 kHz when the temperature is 20°C ...

high frequencies correspond to sharp sounds, like a whistle. Controlling where sound goes is difficult because of a phenomenon called diffraction – the tendency of sound waves to spread out as ...

During the Cold War, the UK required long-range, high-altitude ... speed close to sound, the Vulcan generated more sound due to the aerodynamic effect of the shock waves and turbulent airflow.