| Sound waves with frequencies higher than the upper audible limit of human hearing, typically above 20 kHz. | Ultrasound Waves |
| What are ultrasound waves? | Sound waves with frequencies higher than the upper audible limit of human hearing, typically above 20 kHz. |
| The bouncing back of a wave when it hits a surface through which it cannot pass. | Reflection |
| What is reflection? | The bouncing back of a wave when it hits a surface through which it cannot pass. |
| A device used to detect and measure the presence, strength, or characteristics of a signal or phenomenon. | Detector |
| What is a detector? | A device used to detect and measure the presence, strength, or characteristics of a signal or phenomenon. |
| The interface or transition zone between two different materials. | Boundary |
| What is a boundary? | The interface or transition zone between two different materials. |
| The technique and process of creating visual representations of the interior of a body for clinical analysis and medical intervention. | Medical Imaging |
| What is medical imaging? | The technique and process of creating visual representations of the interior of a body for clinical analysis and medical intervention. |
| An unborn or unhatched offspring in the process of development. | Foetus |
| In what medical context is ultrasound commonly used? | Scanning a foetus in the uterus. |
| The use of ultrasound waves to create images of internal body structures, often used in prenatal care to monitor fetal development. | Ultrasound Imaging |
| How is ultrasound used for medical imaging, such as scanning a foetus in the uterus? | Ultrasound waves are directed into the body and their reflections from boundaries between tissues are measured to form images of internal structures. |
| The number of complete cycles of a wave that occur in a unit of time. | Frequency |
| What characteristic of ultrasound waves makes them useful for medical imaging? | Their high frequency, allowing for detailed imaging and reflection off boundaries between tissues. |
| A technique that uses sound propagation (usually underwater) to navigate, communicate with or detect objects on or under the surface of the water. | Sonar |
| What is sonar? | A technique that uses sound propagation (usually underwater) to navigate, communicate with, or detect objects on or under the surface of the water. |
| Reflected sound waves. | Echoes |
| What are echoes? | Reflected sound waves that return to their source after hitting a boundary or obstacle. |
| A device that emits signals or waves, such as ultrasound waves, to a specific target or area. | Transmitter |
| What is a transmitter? | A device that emits signals or waves, such as ultrasound waves, to a specific target or area. |
| A device that detects and receives signals or waves, such as echoes, reflected from a target or area. | Receiver |
| What is a receiver? | A device that detects and receives signals or waves, such as echoes, reflected from a target or area. |
| The velocity at which sound waves travel through water, typically around 1500 meters per second. | Speed of Sound in Water |
| What is the speed of sound in water? | Typically around 1500 meters per second. |
| The process of determining the distance from the surface of a body of water to the bottom, often using time measurements of reflected sound waves. | Depth Calculation |
| How is depth calculated using sonar? | By measuring the time it takes for ultrasound waves to travel to the sea bed and back, and applying the formula for distance. |
| The remains of a ship that has been wrecked and sunk, typically underwater. | Shipwrecks |
| What can sonar be used to locate underwater? | Shipwrecks or submarines. |
