Sure! Here are the suggested completions for your statements:
A. **Microwaves are utilized in various applications, including cooking, telecommunications, and radar systems.**
B. **Due to their ability to penetrate materials, microwaves are employed in medical imaging, as well as in scientific research.**
C. **Concerns over prolonged exposure to microwaves, particularly from devices like cell phones, have led to ongoing studies regarding their potential health effects.**
**Radar** is a system that uses reflected radio waves to detect objects and measure their distance and speed.
A **microwave oven** works by emitting radio waves at a specific frequency to agitate water molecules in food. The molecules begin to vibrate at the atomic level, producing heat which cooks the food.