Multiple choice

Which of the following dyes are capable of absorbing light in the UV and violet region?

  1. Optical brighteners

  2. Solvent dyes

  3. Fuel dyes

  4. Carbene dye

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A Correct answer
Explanation

Optical brighteners, are dyes that absorb light in the ultraviolet and violet region (usually 340-370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470 nm). Fluorescent activity is a short term or rapid emission response, unlike phosphorescence, which is a delayed emission.

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