Exam (elaborations)
Sci-220 Exam 4 Questions And Answers Latest Update
- Course
- SCI 220
- Institution
- University Of Phoenix
Sci-220 Exam 4 Questions And Answers Latest Update
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Solution 2024/2025Pepper
Sci-220 Exam 4 Questions And Answers Latest
Update
luminescence ANS✔✔ when a substance emits light from a source other
than heat. Must absorb and emit light at different wavelengths
phosphorescence ANS✔✔ -A stimulating light is shown onto an object
-Object absorbs light, retains radiation, and glows
-When light is removed, object still glows
-Example: glow in the dark toys
Fluorescence ANS✔✔ the property of a mineral in which the mineral glows
under ultraviolet light; substance is stimulated by a light source causing it
to glow (ALS photography)
Chemiluminescence ANS✔✔ a material glowing because of a chemical
reaction
see injuries not visible to the naked eye; untreated latent prints ANS✔✔
what is UV and fluorescent lighting used for?
100-400nm ANS✔✔ UV light wavelength
400-700nm ANS✔✔ visible light wavelength
, Solution 2024/2025
Pepper
700-1100nm ANS✔✔ infrared light wavelength
must absorb light at one wavelength and emit it at a different one; LONGER
WAVELENGTH, LOWER INTENSITY ANS✔✔ what causes a substance to
luminesce?
blue light->orange filter; green light->red filter; purple light->yellow filter
ANS✔✔ ALS photography filter
•Use ALS in darker area
•Camera must be mounted to tripod
•Settings may need to adjust depending on the ambient light
-ISO 100-400
-Aperture f/8 or f/11
-Shutter speed 5-10 seconds
•First take as-is photo
•Add orange filter on camera
•PWL using the ALS flashlight ANS✔✔ steps of ALS photography
Reflected Ultraviolet Imaging System ANS✔✔ RUVIS
string method ANS✔✔ -Provides a 3D representation of the spatter
-Find droplets from same pattern and determine area of convergence
-Label droplets alphabetically
-Calculate angle of impact (width/length, inverse sin)
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