Final answer:
The most common areas of a welder's body burned by light are the face and hands and arms, as these are the most exposed during welding. Protective gear like gloves and helmets is essential for safety to shield against intense UVB light and thermal energy.
Step-by-step explanation:
The two most common areas of a welder's body that are burned by light are the face and the hands and arms. Welders are equipped with protective gloves and a helmet to shield against the electric arc. This arc emits a significant amount of thermal energy that can melt metal, produce sparks, and give off high-energy electromagnetic radiation that is capable of causing burns on any exposed skin. High-intensity UVB light from welding can damage the eyes and skin, leading to conditions such as welder's flash (photo keratitis or arc eye) and can even contribute to cataracts over time. Due to their routine exposure and function, a welder's face, hands, and arms are at the highest risk of burns from light emissions during welding activities.