Auto-darkening welding helmets utilize liquid crystal cells paired with photosensors to shield an operator's vision from intense ultraviolet radiation. Under normal lighting conditions, the viewing lens remains transparent, allowing the welder to inspect the workpiece clearly. However, the instant an electric arc is struck, the sensors detect the sudden burst of light and trigger the liquid crystal display to shade within fractions of a millisecond. This rapid transition prevents retinal damage caused by arc eye while eliminating the need for workers to constantly raise and lower their face shields throughout fabrication.
According to the passage, how do auto-darkening welding helmets protect a welder's eyesight?
- ABy keeping the viewing lens transparent the instant an electric arc is struck
- BBy requiring welders to constantly raise and lower their face shields during work
- By rapidly tinting the viewing screen as soon as intense illumination appearsCevap
- DBy using passive polarized glass filters that function without electronic sensors
Cevap
Auto-darkening welding helmets protect eyesight by rapidly tinting the viewing screen as soon as intense illumination appears.
The correct response accurately restates the passage's factual explanation that sensors detect bright light from an arc and cause the liquid crystal display to shade in fractions of a millisecond to prevent eye injury. It uses synonymous language such as 'rapidly tinting' for 'shade within fractions of a millisecond' and 'intense illumination' for 'sudden burst of light'.
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Paraphrased Fact Recognition
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