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3-(2-furoyl)quinoline-2-carboxaldehyde is used as a fluorescent tag that reacts with primary amines in solution. An argon ion laser which operates at 488.2 nm is used to excite the tagged proteins and observe fluorescence. A 5 µM solution gives a signal of 0.852 relative fluorescence units. What is the wave number of the laser light at 488.2 nm?

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