Glass Evidence Review

Glass is a hard, amorphous material made by mixing sand, lime, and other chemical compounds at very high temperatures.

• True

• False

An amphibious solid has its atoms arranged in a random fashion.

• True

• False

Each type of glass has a specific density. This can be used to match glass fragments.

• True

• False

Light leaves window glass (n=2.53) and enters lead crystal (n=3.01). The light will be away from the normal line.

• True

• False

When a projectile hits a window, the glass on the same side as the impact experiences tension and the opposite side gets compressed.

• True

• False

Density of glass is calculated by dividing the

• Substance's atomic mass by its volume

• mass of a substance by its volume

• volume of a substance by its atomic mass

• volume of a substance by its mass

The refractive index is a tool used to study how light bends as it passes through

• three or more substances

• one substance to another

• four or more substance

• none of the above

As the density of a material increases, the speed of light passing through it

• speeds up

• slows down

• does not change

• changes randomly

The speed of light passing through air is slightly

• slower than the speed of light in a vacuum, because air is slightly denser than a vacuum

• faster than the speed of light passing through a vacuum, because air is slightly denser than a vacuum

• slower than the speed of light in a vacuum, because air is less dense than a vacuum

• none of the above

One way to see if evidence glass matches glass from a crime scene is to compare the _____________ of the two

• absorption index

• refractive index

• reflective index

• none of the above