Radar primarily uses what to detect objects and measure distance?

Radar primarily uses what to detect objects and measure distance?

• A. Reflected radio waves
• B. Direct magnetic fields
• C. Infrared light
• D. Sound waves

Answer: (A)

Radar works by emitting radio waves and listening for their reflections. When those waves hit an object, they bounce back to the radar, and the system uses the time it takes for the echo to return to calculate distance, since radio waves travel at the speed of light. This focus on reflected radio waves is what lets radar detect objects and measure how far away they are. Other options aren’t how radar operates: magnetic fields aren’t used for distance measurement in radar, infrared light is used in different sensing methods like thermal imaging, and sound waves are used in sonar, not radar.

Radar works by emitting radio waves and listening for their reflections. When those waves hit an object, they bounce back to the radar, and the system uses the time it takes for the echo to return to calculate distance, since radio waves travel at the speed of light. This focus on reflected radio waves is what lets radar detect objects and measure how far away they are. Other options aren’t how radar operates: magnetic fields aren’t used for distance measurement in radar, infrared light is used in different sensing methods like thermal imaging, and sound waves are used in sonar, not radar.