Podcast
Questions and Answers
What is the absorption spectrum commonly observed as?
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?
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?
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?
What is the primary cause of blue color in type IIb diamonds?
Which statement correctly describes fluorescence in gems?
Which statement correctly describes fluorescence in gems?
What does the term 'wavelength' refer to?
What does the term 'wavelength' refer to?
What typically causes the green color in diamonds?
What typically causes the green color in diamonds?
What is the visible spectrum range of wavelengths?
What is the visible spectrum range of wavelengths?
What is the main effect of defects in a diamond's crystal lattice on its appearance?
What is the main effect of defects in a diamond's crystal lattice on its appearance?
How does luminescence differ from phosphorescence in gems?
How does luminescence differ from phosphorescence in gems?
What does the electromagnetic spectrum encompass?
What does the electromagnetic spectrum encompass?
What is meant by the band gap in the context of gemology?
What is meant by the band gap in the context of gemology?
What defines selective absorption in materials?
What defines selective absorption in materials?
What is the primary cause for the yellow color observed in diamonds?
What is the primary cause for the yellow color observed in diamonds?
What phenomenon causes the continued emission of visible light after UV or X-ray stimulation has stopped?
What phenomenon causes the continued emission of visible light after UV or X-ray stimulation has stopped?
A defect that can influence an object’s absorption of visible light to cause its color is ?
A defect that can influence an object’s absorption of visible light to cause its color is ?
Closely spaced grain lines where color concentrates is ?
Closely spaced grain lines where color concentrates is ?
The process by which light not absorbed by a material returns to the observer is ?
The process by which light not absorbed by a material returns to the observer is ?
The range of wavelengths of radiant energy extending from high energy to low energy, including visible light is ?
The range of wavelengths of radiant energy extending from high energy to low energy, including visible light is ?
Light is a form of radiant energy that travels in ...
Light is a form of radiant energy that travels in ...
Light of shorter wavelengths has higher energy than light of ......
Light of shorter wavelengths has higher energy than light of ......
Visible light is a small portion of the .......
Visible light is a small portion of the .......
White light is a combination of .....
White light is a combination of .....
The spectroscope and spectrometer can help gemologists see a diamond’s .....
The spectroscope and spectrometer can help gemologists see a diamond’s .....
Interaction of electrons with visible light causes ......
Interaction of electrons with visible light causes ......
Diamonds without color centers are colorless due ........
Diamonds without color centers are colorless due ........
Color-causing defects work as energy “steps” within a diamond’s band gap to ease...........
Color-causing defects work as energy “steps” within a diamond’s band gap to ease...........
Naturally irradiated diamonds usually contain areas of ..........
Naturally irradiated diamonds usually contain areas of ..........
Inclusions are the main causes of .....
Inclusions are the main causes of .....
Luminescence is an efficient visual test for .......
Luminescence is an efficient visual test for .......
The energy level of luminescence is lower than that of..........
The energy level of luminescence is lower than that of..........
The GR1 defect, caused by radiation, can create.......
The GR1 defect, caused by radiation, can create.......
_______caused selective absorption is the main cause of color in pink-to-red diamonds.
_______caused selective absorption is the main cause of color in pink-to-red diamonds.
What type of radiant energy is found on the electromagnetic spectrum?
What type of radiant energy is found on the electromagnetic spectrum?
What do electrons do when visible light is emitted during luminescence?
What do electrons do when visible light is emitted during luminescence?
What subatomic particles interact with light to produce color?
What subatomic particles interact with light to produce color?
What does irradiation create when it displaces carbon atoms in the crystal lattice?
What does irradiation create when it displaces carbon atoms in the crystal lattice?
Flashcards
Absorption Spectrum
Absorption Spectrum
Pattern of dark lines/bands in gems when viewed through a spectroscope or spectrometer.
Band Gap
Band Gap
Energy difference between valence & conduction bands in a material (e.g., diamond).
Color Center
Color Center
A defect affecting a gem's absorption of visible light to cause color.
Selective Absorption
Selective Absorption
Signup and view all the flashcards
Visible Spectrum
Visible Spectrum
Signup and view all the flashcards
Wavelength
Wavelength
Signup and view all the flashcards
Diamond Color Causes
Diamond Color Causes
Signup and view all the flashcards
Luminescence
Luminescence
Signup and view all the flashcards
Electromagnetic Spectrum
Electromagnetic Spectrum
Signup and view all the flashcards
White Light
White Light
Signup and view all the flashcards
What is a key factor in diamond color?
What is a key factor in diamond color?
Signup and view all the flashcards
Spectroscope
Spectroscope
Signup and view all the flashcards
How do electrons interact with light?
How do electrons interact with light?
Signup and view all the flashcards
What causes yellow in diamonds?
What causes yellow in diamonds?
Signup and view all the flashcards
What causes green in diamonds?
What causes green in diamonds?
Signup and view all the flashcards
What causes blue in diamonds?
What causes blue in diamonds?
Signup and view all the flashcards
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
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!
