its too bright in here
the characteristic that allows determination of elemental composition is known as what
selective absorption and emission of light
what are alpha particles
neutrons and protons
what is the process called when isotopes decompose over time
radioactive decay
what are the four coats of paint
electrocoat primers, primer surfacer, base coat, clear coat
how does the usefulness of hair, in an investigation, change when hair is forcibly pulled from the head vs naturally shed
forcibly removed: cuticle is left and has DNA
Naturally shed no useful DNA
the emission spectrum is the separation of light into its color component. what is the spectrum that blends colors
continuous spectrum
what has caused the comparison of glass to become difficult
advanced technology that increases uniformity of products
isotopes are atoms with the same number of protons but different number of ____
neutrons
which layer is the primer surfacers and why is it highly pigmented
2
smoothes out and hides imperfections, highly pigmented to minimize color contrast
what can soil analysis add to as evidence
link suspect to physical crime scene
what is used as an invisible marker when investigating evidence
trace elements
say someone broke a windshield of my friends car by throwing a brick at it, what type of glass was in the window
laminated
radioactivity is composed of what three types of radiation
alpha particles, beta particles, gamma rays
what is the base coats job and what is it dictated by
actual color of car
weather UV and acid rain resistant
toxic and environmental concerns
what is the first step when analyzing soil
look at the overall color and texture
Not all light sources produce a continuous spectra. What are some elements that produce a line spectrum instead
sodium, mercury, neon
hydrogen has 3 isotopes. name them
hydrogen
deuterium
tritium
gamma rays are similar to x-rays, but have ______________ frequency and energy. what type of radiation do they have
higher
electromagnetic radiation
what is the electrocoat primer
corrosion resistant and electroplated onto the metal frame of the car
the hair shaft is composed of 3 layers, name 2.
cortex
medulla
cuticle
the ICP- the inductively coupled plasma, identifies and measures elements through what
light energy emitted by excited atoms
what are the three categories glass can be classified as
float glass, container glass, borosilicates
what analytical technique that relies on the measurement of gamma rays emitted from a sample that was bombarded by neutrons
neutron activation analysis
what is the clear coats job
improves gloss, durability and appearance
why is it important to look in the mud at the crime scene
there might be prints or tracks left by suspects