AMicrowave
BRadio wave
CInfrared
DGamma ray
Answer:
A. Microwave
Read Explanation:
RADAR stands for Radio Detection and Ranging.
It primarily utilizes Microwaves or Radio Waves within the electromagnetic spectrum to detect, track, and identify objects.
These waves have wavelengths ranging from approximately 1 millimeter to 1 meter and frequencies between 300 MHz and 300 GHz.
Echolocation Logic: RADAR systems transmit radio pulses towards a target. When these pulses encounter an object, they reflect back to the receiver.
Distance Calculation: The time delay between the transmission of the pulse and the reception of the echo allows the system to calculate the precise distance (range) of the object using the speed of light formula (c = speed of radio waves).
Doppler Effect: Many modern systems use the Doppler shift of the returning signal to measure the velocity of moving targets (e.g., in weather tracking or speed guns).
Common Uses:
Aviation: Air Traffic Control (ATC) for tracking aircraft positions and altitudes.
Maritime: Navigational assistance for ships to avoid collisions and track coastlines.
Meteorology: Weather RADAR (Doppler RADAR) is used to detect precipitation, storm intensity, and wind speed.
Defense: Missile guidance systems and early warning detection for military surveillance.