history 😳😳
Where was glass first discovered in 2500 B.C?
Egypt 🇪🇬
What type of solid is glass?
Amorphous solid
What is the main way to find mass?
A beam device/scale
How does a bullet have to be fired to create a round entry hole?
Perpendicular from the glass pane
The following items were found at a crime scene: Hair, body fluids, soil, glass, and documents. Which one of these is not trace evidence?
Documents
What was the most popular type of glass in Europe in the 14th century?
Window and stained glass 🫗
What are the three ingredients of glass?
Silica (melted sand), calcium oxide (lime), and sodium oxide
What is the formula for density?
Density = mass/volume
Is the exit side larger or smaller than the entrance side?
The exit side is larger
How does crazed glass form and how can you identify it?
Crazed glass forms under thermal stress and you can identify it by fine cracks in the glass.
How was glass formed before man-made glass?
Sand and rock exposed to extremely high temperature
What oxide creates red glass?
Cuprous oxide
What is Refractive Index?
A measurement of how much a material slows and bends light
What's the alternative name to Snell's Law?
Law of Refraction
What era was glass first mass produced?
Industrial Revolution
What solid has an irregular atomic structure and what solid has a regular atomic structure?
Regular atomic structure = Crystalline solid
Density and Refractive Index are sure ways to find the suspect of a crime. If you discover these, you'll find the true culprit. True or false?
False
What is the fourth step to handling glass evidence?
Make a diagram
What country kept glass production a secret?
Italy, Venice (Murano) 🇮🇹
A piece of glass found on a suspect has the same refractive index and density as the glass found at a crime scene. Should you arrest the suspect? Why?
No, although the refractive index and density may be the same the glass may not be from the same source. It's important to refer to other details such as occupation, prior events, etc.
Does light slow down or speed up when it moves mediums? Why?
Light slows down when it moves mediums because the Refractive Index of glass is higher than air.
Wade, Tony, Peter, Johnny, and Diana were at a party. An expensive vase gets broken during this party. The following pieces of glass were found on each person respectively: 0.2 Refractive Index and 6.42g/cm3 density, 0.5 Refractive Index and 5.72g/cm3 density, 0.8 Refractive Index and 6.70g/cm3 density, 0.8 Refractive Index and 6.70g/cm3 density, and 1.52 Refractive Index and 2,500kg/cm3 density. Wade is a stand up guy, Tony hosted the party, Peter is your friendly neighbor who you know is a clumsy guy, Johnny is a rebellious guy, and Diana is a wonderous woman. Consider their personalities and determine who the culprit might be.
Peter 🕷 and Johnny 🔥