Ass #6 - Key Terms and Concepts
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Questions and Answers

What is the absorption spectrum commonly observed as?

  • A continuous gradient of colors
  • A pattern of dark vertical lines (correct)
  • A pattern of bright horizontal bands
  • A ratio of colors in a gem's structure

    • Which of the following describes selective absorption?

  • The emission of invisible light only
  • The absorption of all components of visible light
  • The absorption of certain components of visible light (correct)
  • The process that reflects all visible light

    • Which defect is most commonly associated with yellow color in diamonds?

  • Colored lamellae
  • GR1 defect
  • Nitrogen-related defects (correct)
  • Boron impurities

    • What is the primary cause of blue color in type IIb diamonds?

    <p>Boron impurities</p> Signup and view all the answers

    Which statement correctly describes fluorescence in gems?

    <p>Emission of visible light during UV or X-ray stimulation</p> Signup and view all the answers

    What does the term 'wavelength' refer to?

    <p>The distance between two adjacent high or low points of a wave</p> Signup and view all the answers

    What typically causes the green color in diamonds?

    <p>Radiation exposure</p> Signup and view all the answers

    What is the visible spectrum range of wavelengths?

    <p>400 nm to 700 nm</p> Signup and view all the answers

    What is the main effect of defects in a diamond's crystal lattice on its appearance?

    <p>They influence the diamond's color.</p> Signup and view all the answers

    How does luminescence differ from phosphorescence in gems?

    <p>Phosphorescence involves a longer emission of light after stimulation stops</p> Signup and view all the answers

    What does the electromagnetic spectrum encompass?

    <p>The range of wavelengths of radiant energy, low and high energy, and visible light</p> Signup and view all the answers

    What is meant by the band gap in the context of gemology?

    <p>The energy difference between the valence band and the conduction band.</p> Signup and view all the answers

    What defines selective absorption in materials?

    <p>Absorbing some components of visible light and transmitting others.</p> Signup and view all the answers

    What is the primary cause for the yellow color observed in diamonds?

    <p>Presence of nitrogen-related defects.</p> Signup and view all the answers

    What phenomenon causes the continued emission of visible light after UV or X-ray stimulation has stopped?

    <p>Phosphorescence</p> Signup and view all the answers

    A defect that can influence an object’s absorption of visible light to cause its color is ?

    <p>Color Center</p> Signup and view all the answers

    Closely spaced grain lines where color concentrates is ?

    <p>Colored Lamellae</p> Signup and view all the answers

    The process by which light not absorbed by a material returns to the observer is ?

    <p>Transmission</p> Signup and view all the answers

    The range of wavelengths of radiant energy extending from high energy to low energy, including visible light is ?

    <p>Electromagnetic Spectrum</p> Signup and view all the answers

    Light is a form of radiant energy that travels in ...

    <p>waves</p> Signup and view all the answers

    Light of shorter wavelengths has higher energy than light of ......

    <p>longer wavelengths</p> Signup and view all the answers

    Visible light is a small portion of the .......

    <p>electromagnetic spectrum</p> Signup and view all the answers

    White light is a combination of .....

    <p>spectral colors.</p> Signup and view all the answers

    The spectroscope and spectrometer can help gemologists see a diamond’s .....

    <p>absorption spectrum</p> Signup and view all the answers

    Interaction of electrons with visible light causes ......

    <p>most selective absorption–related gem colors</p> Signup and view all the answers

    Diamonds without color centers are colorless due ........

    <p>to the lack of visible light absorption.</p> Signup and view all the answers

    Color-causing defects work as energy “steps” within a diamond’s band gap to ease...........

    <p>the electron transitions “fueled” by visible light absorption.</p> Signup and view all the answers

    Naturally irradiated diamonds usually contain areas of ..........

    <p>green or brown radiation damage on their surfaces or penetrating into the stones.</p> Signup and view all the answers

    Inclusions are the main causes of .....

    <p>black, gray, and white colors in diamond</p> Signup and view all the answers

    Luminescence is an efficient visual test for .......

    <p>diamond identification</p> Signup and view all the answers

    The energy level of luminescence is lower than that of..........

    <p>the radiation source</p> Signup and view all the answers

    The GR1 defect, caused by radiation, can create.......

    <p>blue color in diamonds with low nitrogen concentrations</p> Signup and view all the answers

    _______caused selective absorption is the main cause of color in pink-to-red diamonds.

    <p>Deformation</p> Signup and view all the answers

    What type of radiant energy is found on the electromagnetic spectrum?

    <p>electric and magnetic</p> Signup and view all the answers

    What do electrons do when visible light is emitted during luminescence?

    <p>electrons must release</p> Signup and view all the answers

    What subatomic particles interact with light to produce color?

    <p>Electrons</p> Signup and view all the answers

    What does irradiation create when it displaces carbon atoms in the crystal lattice?

    <p>Vacancies</p> Signup and view all the answers

    Study Notes

    Absorption Spectrum

    • A pattern of dark vertical lines or bands, shown by gems when viewed through a spectroscope or a linear graph.

    Band Gap

    • The energy difference between valence band and conduction band.

    Color Center

    • A defect impacting an object's visible light absorption, leading to color.

    Colored Lamellae

    • Closely spaced grain lines concentrating color.

    Electromagnetic Spectrum

    • The range of radiant energy wavelengths, from high to low energy, including visible light.

    Fluorescence

    • Emission of visible light from UV or X-ray radiation stimulation.

    Luminescence

    • Emission of visible light when exposed to radiation.

    Phosphorescence

    • Continued emission of visible light after radiation stops.

    Selective Absorption

    • The process where a material absorbs some visible light components and transmits others.

    Transmission

    • The process of unabsorbed light returning to the observer.

    Visible Spectrum

    • The range of visible light wavelengths, from 400nm (violet) to 700nm (red).

    Wavelength

    • The distance between two adjacent high or low points of a wave.

    Key Concepts (Light)

    • Light is radiant energy traveling in waves.
    • Shorter wavelengths have higher energy.
    • Visible light is a portion of the electromagnetic spectrum.
    • White light is a combination of spectral colors.

    Key Concepts (Diamonds)

    • Diamond color originates from crystal lattice defects.
    • Spectroscopes/spectrometers help analyze absorption spectra.
    • Visible light interacting with electrons causes selective absorption.
    • Colorless diamonds lack visible light absorption.

    Key Concepts (Diamond Color)

    • Color-causing defects work as energy steps within a diamond's band gap, easing electron transitions.
    • Nitrogen defects are common causes of yellow diamonds.
    • Radiation damage often leads to green/brown colors.
    • Boron impurities cause blue in type IIb diamonds.
    • Deformation-caused selective absorption is behind pink to red colors.
    • Inclusions cause black, gray, and white colors.

    Luminescence

    • Lower energy level compared to radiation source.
    • An efficient visual test for diamond identification.

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    ASS #6- Key Terms & Concepts PDF

    Description

    This quiz explores various concepts related to the electromagnetic spectrum and light phenomena, including absorption and emission processes. Test your understanding of topics such as fluorescence, phosphorescence, and selective absorption. Dive into the fascinating world of how light interacts with matter!

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