Quartz cuvettes are designed to provide a standard value of 1 for this variable. For 10 points each:
[10e] Name this variable symbolized b. Like molarity, it is directly proportional to absorption by Beer’s law.
ANSWER: path length [or distance]
[10h] These devices provide effective path lengths in the kilometers in a form of spectroscopy that measures the time it takes a signal to “ring-down,” allowing the detection of concentrations in the parts-per-billion.
ANSWER: optical cavity [or optical cavities; or optical resonators; accept cavity ring-down (absorption) spectroscopy or Fabry–Pérot etalons; prompt on interferometers]
[10m] Open-path cavity ring-down provides a way to monitor this compound and ammonia at agricultural sites. The EPA uses ground-based atmospheric analysis to detect “fugitive” production of this compound, which can be reduced by flaring at exploration and production operations.
ANSWER: methane [or CH4; prompt on natural gas]
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