Question

what is ultrasound ?write four applications of ultrasound

Answer 1

Sound waves with frequencies higher than the upper audible limit of human hearing are called ultrasound. The limit varies from person to person, but is approximately 20,000 hertz. 
Applications:

Cleaning:

In objects with parts that are difficult to reach, for example spiral tubes and electronic components, the process of ultrasonic cleaning is used. 

Ultrasound is used to detect cracks in the metallic components that are used in the construction of high rise structures such as buildings and bridges

SONAR:

SONAR, sound navigation and ranging is a technique in which sound waves are used to navigate, detect and communicate  under the surface of the water.

Answer 2

hlooo friend!!

------------------------------------------------------------------------------------------------------
ultrasound : Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. ... Ultrasonic devices are used to detect objects and measure distances. Ultrasound imaging or sonography is often used in medicine.
------------------------------------------------------------------------------------------------------
four applications of ultrasound are : 

Ultrasonography:

Medical ultrasound is a diagnostic imaging technique based on ultrasound. It is used for the imaging of internal body structures such as muscles, joints and internal organs. Ultrasonic images are known as sonograms. In this process, pulses of ultrasound are sent to the tissue using a probe. The sound echoes off the tissue, where different tissues reflect sound varying in degrees. 

SONAR, sound navigation and ranging is a technique in which sound waves are used to navigate, detect and communicate  under the surface of the water.

Echolocation:

Echolocation is the process where sound waves and echoes are used to determine objects in space. Echolocation is used by bats to navigate and find their food in the dark. Bats send out sound waves from their mouth and nose, which then hit the objects in their vicinity producing echoes, which are then received by the bats. The nature of the echo helps them determine the size, the shape and the distance of the object.

Ultrasonography:

Medical ultrasound is a diagnostic imaging technique based on ultrasound. It is used for the imaging of internal body structures such as muscles, joints and internal organs. Ultrasonic images are known as sonograms. In this process, pulses of ultrasound are sent to the tissue using a probe. The sound echoes off the tissue, where different tissues reflect sound varying in degrees. 

----------------------------------------------------------------------------------------------------

i hope it may help u!!!

plzzz mark me at brainlist!!!!