Discussion
A shift in a gold colloid's plasmon absorption band toward longer wavelength suggests the particles have
Answer: C
Correct answer: grown or begun to aggregate
The plasmon resonance depends on particle size and on the coupling between neighbouring particles, and both growth and aggregation shift it to longer wavelength. This is why an aggregating gold colloid turns from red through purple to grey, and why the shift is used as a sensitive optical signal in assays.
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