Which infrared application is a military use?

• A. Weather forecasting
• B. Short-range wireless communication
• C. Target acquisition
• D. Spectroscopy

Answer: (C)

Infrared sensing detects heat emitted by objects, and in military use this heat signature is key to locating and identifying potential targets, especially in darkness or through smoke and camouflage. This capability—seeing heat differences to find and track a target before engagement—is what makes infrared a powerful tool for target acquisition.

Other infrared applications like weather forecasting use infrared to infer atmospheric temperatures and cloud tops, which is meteorology rather than a battlefield function. Short-range infrared communication is a general tech for line-of-sight data transfer, not a primary military targeting use. Infrared spectroscopy is a lab/application for material analysis, not directly about locating or engaging targets. So the military-relevant use of infrared here is target acquisition.