Discussion
A solution has an absorbance of \( 0.30 \). Its transmittance is about
Answer: D
Inverting the logarithmic relation:
\[ T = 10^{-0.30} \approx 0.50 \]
giving about 50 per cent. Thirty per cent would confuse the absorbance's numerical value with a percentage. That 0.3 absorbance is almost exactly half the light is worth remembering, since it is the same 3 dB relationship that appears throughout engineering, expressed in a different unit.
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