A HELP Which TWO technologies use reflected sound waves? A. Radar B. Solar Panels C. Sonar D. Ultrasound Imaging

Sonar and Radar

Explanation:

at least i think so, solar panels r used for the sun, and ultrasound is x-ray. srry if im wrong

Pretty sure its C.sonar and D.Utlrasound Imaging

Explanation:

For D, ultrasound Imaging is using sound waves to map stuff, so it sends the sound waves out, and if the waves come back it uses those to map what something is and how far it may be based on the sound waves that come back to it.  Sonar (sound navigation and ranging) is a technology that uses acoustical waves to sense the location of objects in the ocean. A simple sonar device can send out a sound pulse from a transducer, and then precisely measure the time it takes for the sound pulses to be reflected back to the transducer.

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.