Discussion
A \( 30 \ \mathrm{m} \) column gives \( 90000 \) plates. Its plate height is
Answer: A
Dividing length by plate number:
\[ H = \frac{30 \ \mathrm{m}}{90000} = 0.33 \ \mathrm{mm} \]
giving 0.33 millimetres, typical of a good capillary column. A packed column might give ten times that. Converting to a length per plate is what makes a thirty-metre capillary and a two-metre packed column directly comparable.
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