glass & soil review – part 2
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Glass & Soil Review – Part 2. ______________ solids Refract a beam of light in two different light-ray components (wavelengths) Results in double refraction . Crystalline. - PowerPoint PPT PresentationTRANSCRIPT
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GLASS & SOIL REVIEW – PART 2
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______________ solids Refract a beam of light in two different light-ray components (wavelengths)
Results in double refraction
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Crystalline
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The numerical difference between these the two refractive indices of a crystalline solid is known as ________________.
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Birefringence
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This is an example of.. . . . . .
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Birefringence
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Technique used to determine the refractive index of a glass sample is known as the _____________ method.
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Immersion
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As the velocity of a fast moving projectile decreases, the irregularity of hole and cracks ____________.
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increase
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Exhibit (a) only shows a __________ fracture
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Radial
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Glass Collection
True or FalseAll broken glass at a crime scene must be collected, regardless of the size.
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FALSE Know ALL of these steps for Glass collection Collect all glass found for piecing Submit all glass evidence found
in the possession of the suspect Collect only a representative
sample of broken glass remaining at the crime scene
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True or FalseOnce collected glass should be wrapped up in paper to prevent further damage.
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False, Packaged in solid containers to avoid further breakage
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Soil CollectionStandard/reference soils should be taken from the crime scene at various intervals within a ______-yard radius of the crime scene.
This will be used as a comparison to questioned soil.
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100
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Soil is a mixture of _______ and _________ material.
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Soil is a mixture of organic and inorganic material.
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An example of 100% inorganic soil is _________while an example of a nearly 100% organic soil would is ________.
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An example of 100% inorganic soil is sand while an example of a nearly 100% organic soil would is peat.
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The inorganic part of soil is ________.
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minerals
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The organic part of soil is known as _______ which is made up of __________________.
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Humas
decayed plant and animal material
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The forensic definition of soil includes many things, including:
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1. Bits of grass 9. Seeds2. Cinders 10. Animal matter3. Asphalt 11. Spores4. paint5. metals 6. concrete 7. Bricks8. Vegetation
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List the five major factors that influence a soil’s composition.
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1. Climate2. Parent material3. Living organisms4. Topography5. Time
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True or FalseSoil is class evidence - cannot be individualized to a particular location
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True
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True or False• There is no classification system for soils
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True – only guidelines
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True or FalseSoils can be easily transported
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True – which makes it excellent trace evidence.
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True or FalseSoils within a few meters horizontally or vertically differ
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True
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True or FalseAfter removing the first 2- 3 inches of top soil, a forensic soil analyst can tell if a body has been buried below.
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True