The task that is completed with infrared radiation is diagnosing a broken bone or decayed tooth. Infrared radiation is used in some imaging techniques, such as thermography, to detect issues in the body.
The other tasks mentioned involve different forms of radiation or technology: removing bacteria from the air typically involves ultraviolet (UV) light, cell phone communication generally uses radio waves, and fiber optic cables transmit data through light waves (usually visible light or near-infrared).
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