Refractive index compares the speed of light in a vacuum to its speed through what substance?

Which of the following properties would not be examined when comparing two synthetic fibers?

As currently performed, DNA-profiling technology cannot provide information that would help with which of the following?

A piece of glass is immersed in a liquid. It proceeds to float on the liquid’s surface. This shows that the density of the glass is ________ the density of the liquid.

A DNA sample is normally said to have a low copy number when it contains fewer than ________ DNA-bearing cells.

When words have been crossed out, document examiners frequently uncover the original writing with the aid of what?

What is indicated by the larger opening of a crater-shaped hole in glass made by the penetration of a projectile?

A conventional STR profile emanating from a mixture of DNA from male donors yields four peaks or bands for each locus present. How many peaks or bands would you normally expect for each locus if a Y-STR profile is performed on the same sample?

What fiber’s microscopic appearance includes a ribbon like shape (i.e., flat) with twists at irregular intervals?

What part of a hair contains its scales?