What is the term for a molecule that absorbs light at specific wavelengths?

What is the term for a molecule that absorbs light at specific wavelengths?

• A. Collimated Light
• B. Chromophore
• C. Delivery System
• D. Electromagnetic Spectrum

Answer: (B)

A chromophore is the part of a molecule that absorbs light at specific wavelengths. It usually contains a conjugated system of alternating double and single bonds, creating an energy gap that matches particular photon energies. When light with that energy shines on the molecule, electrons are promoted to higher energy levels, and that wavelength is absorbed. The color we see comes from the light that is not absorbed. In practice, pigments like melanin act as chromophores, determining which wavelengths are absorbed by tissue and influencing how light-based treatments interact with the skin. The other terms don’t describe a molecule’s light-absorbing property: collocated light refers to beam geometry, delivery system is about delivering light to tissue, and the electromagnetic spectrum is the range of all wavelengths, not the absorbing part of a molecule.

A chromophore is the part of a molecule that absorbs light at specific wavelengths. It usually contains a conjugated system of alternating double and single bonds, creating an energy gap that matches particular photon energies. When light with that energy shines on the molecule, electrons are promoted to higher energy levels, and that wavelength is absorbed. The color we see comes from the light that is not absorbed. In practice, pigments like melanin act as chromophores, determining which wavelengths are absorbed by tissue and influencing how light-based treatments interact with the skin. The other terms don’t describe a molecule’s light-absorbing property: collocated light refers to beam geometry, delivery system is about delivering light to tissue, and the electromagnetic spectrum is the range of all wavelengths, not the absorbing part of a molecule.