Reference Terms
from Wikipedia, the free encyclopedia
Ultrasound
Ultrasound is sound with a frequency greater than the upper limit of human hearing, approximately 20 kilohertz (20,000 hertz).
Note: The above text is excerpted from the Wikipedia article "Ultrasound", which has been released under the GNU Free Documentation License.
Related Stories
1
2
Matter & Energy News
May 22, 2025
May 14, 2025 — A new study achieves unprecedented accuracy in modelling extreme cosmic events like black hole and neutron star collisions by calculating the fifth post-Minkowskian (5PM) order, crucial for interpreting gravitational wave data from current and ...
May 8, 2025 — In space, energetic neutrinos are usually paired with energetic gamma rays. Galaxy NGC 1068, however, emits strong neutrinos and weak gamma rays, which presents a puzzle for scientists to solve. A new paper posits that helium nuclei collide with ...
May 8, 2025 — A new study of the 28 most populous U.S. cities finds that all are sinking to one degree or another. The cities include not just those on the coasts, where relative sea level is a concern, but many in the interior. Furthermore, using newly granular ...
May 7, 2025 — Physicists captured the first images of individual atoms freely interacting in space. The pictures reveal correlations among the 'free-range' particles that until now were predicted but never directly ...
Latest Headlines
updated 12:56 pm ET
May 21, 2025 — Scientists have demonstrated a new recording principle that improves recording efficiency by 35% by combining spin torque with conventional heat-assisted magnetic recording (HAMR). This advancement ...
May 21, 2025 — Researchers have demonstrated that by using a semiconductor with flexible bonds, the material can be moulded into various structures using nano ...
May 20, 2025 — Scientists developed a smartphone-compatible ethanol sensor using a metal-organic framework called Cu-MOF-74. The sensor visually detects ethanol concentrations across a wide range, with no ...
May 19, 2025 — More than 400 underwater sites in the United States are potentially contaminated with unexploded ordnance -- weapons that did not explode upon ...
May 14, 2025 — have created a new type of insect cyborg that can navigate autonomously -- without wires, surgery, or stress-inducing electrical shocks. The system uses a small ultraviolet (UV) light helmet to steer ...
May 22, 2025 — Self-driving cars which eliminate traffic jams, getting a healthcare diagnosis instantly without leaving your home, or feeling the touch of loved ...
May 22, 2025 — Engineers developed a membrane that filters the components of crude oil by their molecular size, an advance that could dramatically reduce the amount of energy needed for crude oil ...
May 22, 2025 — Chemists have developed an efficient skeletal editing method for frequently used heteroaromatic structures. The technique could serve as a means to chemically modify biologically active ...
May 22, 2025 — Neuroscientists and materials scientists have created contact lenses that enable infrared vision in both humans and mice by converting infrared light ...
May 20, 2025 — A metamaterial is a composite material that exhibits unique properties due to its structure, and now researchers have used one featuring a small sawtooth pattern on its surface to move and position ...