Discussion
Using a \( 5 \ \mathrm{cm} \) cell instead raises that absorbance to
Answer: A
Absorbance is proportional to path length:
\[ A = 10^{4} \times 5 \times 10^{-5} = 0.5 \]
giving 0.5. A longer cell is the standard way to measure a dilute solution, bringing the reading into the range where photometric error is least. That one of the three terms is under the operator's control, and can be changed by a factor of ten, is a practical lever worth remembering when a sample is too dilute to read reliably.
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