Crime scene about 1 square inch of sample is usually

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crime scene (about 1 square inch of sample is usually adequate for this purpose) The glass fragments should be packaged in solid containers to avoid further breakage
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The standard/reference glass should always be taken from any remaining glass in a sample of broken glass remaining glass in the window or door frames, as close as possible to the point of breakage Glass fragments should be package in solid containers to avoid further breakage - If the suspect’s shoes/ and or clothing are to be examined for the presence of glass fragments, they should be individually wrapped in paper and transmitted to the laboratory - Field investigator should avoid removing such evidence from garments unless absolutely necessary for its preservation When a determination of the direction of impact is desired, all broken glass must be recovered and submitted for analysis - When this is not immediately apart, the presence of dirt, paint, grease, or putty may indicate the exterior surface of the glass Review Questions and Answers 1. Anything that has mass and occupies space is defined as _MATTER______. 2. The basic building blocks of all substances are the ___ELEMENTS________. 3. The number of elements known today is ____118_______. 4. An arrangement of elements by similar chemical proper- ties is accomplished in the ___PERIODIC________ table. 5. A(n) _____ATOM______ is the smallest particle of an element that can exist. 6. Substances composed of two or more elements are called __COMPOUNDS__. 7. A(n) __MOLECULE___ is the smallest unit of a compound formed by the union of two or more atoms. 8. The physical state that retains a definite shape and volume is a(n) ___SOLID________. 9. A gas (has, has no) definite shape or volume. __ HAS NO___ 10. During the process of ____SUBLIMATION__, solids go directly to the gaseous state, bypassing the liquid state. 11. The attraction forces between the molecules of a liquid are (greater, less) than those in a solid. ___LESS___ 12. Different __PHASES_________ are separated by definite visible boundaries. 13. Mass per unit volume defines the property of _______DENSITY____. 14. If an object is immersed in a liquid of greater density, it will (sink, float). _-FLOAT___ 15. The bending of a light wave because of a change in velocity is called ___REFRACTION________. 16. The physical property of ___REFRACTIVE INDEX________ is determined by the ratio of the velocity of light in a vacuum to light’s velocity in a substance
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17. True or False: Solids having an orderly arrangement of their constituent atoms are crystalline. __TRUE_________ 18. Solids that have their atoms randomly arranged are said to be _AMORPHOUS__________. 19. The crystal calcite has two indices of refraction. The difference between these two values is known as ____BIREFRINGENCE _______. 20. The process of separating light into its component colors or frequencies is known as ___DISPERSION________. 21. True or False: Color is a usual indication that substances selectively absorb light. ___TRUE________ 22. The distance between two successive identical points on a wave is known as _______WAVELENGTH____.
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  • Fall '19
  • Light, Wavelength, refractive index

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