As a longitudinal wave moves through a medium,
the particles of the medium
(1) vibrate parallel to the direction of the wave’s
propagation
(2) vibrate perpendicular to the direction of the
wave’s propagation
(3) are transferred in the direction of the wave’s
motion, only
(4) are stationary

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.