What tells scientists about distant galaxies? a. how fast light travels c. the color of light that they give off b. if the are opaque or transparent d. the kind of radio wave they give off

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.