Discussion
Quartz cells rather than glass are required for ultraviolet spectroscopy because glass
Answer: A
Correct answer: absorbs ultraviolet radiation
Ordinary glass is opaque below about 350 nm, so it would absorb the very radiation being measured and no light would reach the detector across most of the ultraviolet range. Fused quartz transmits down to about 190 nm and is used instead. Glass is perfectly adequate in the visible region, and plastic cells serve there for routine work.
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