Rohit Dhyani: Electromagnetic
spectrum: This
spectrum depicts light as a wave of radiation, which has both a peak height
(amplitude) and a distance between peaks (wavelength).
Fluorescence: A stimulating light, usually from a
laser or alternate light source, is directed onto a surface. Molecules in the
surface will become excited, and some of their electrons will rise to a higher
electronic state. As they return to their previous state, energy is emitted.
The light subsequently emitted has a lower intensity than the original
stimulating light. Light of a different wavelength and frequency also has a
different color.
Infrared
light: The
photographic area of the infrared (IR) range is in the near IR part of the
electromagnetic spectrum, 700 to 1100 nm.
Luminescence: A molecule’s ability to “glow” from
causes other than heat, and luminescence and phosphorescence are both types of
luminescence.
Phosphorescence: The ability of some materials to
retain some of the radiation they have absorbed after the stimulating light has
ceased. This energy can then be released over long durations: “glow in the
dark” toys are an example.
Photographic
infrared range: The
range on the electromagnetic spectrum between approximately 700 and 1100 nm.
Prioritizing
perishables: Some
evidence may remain at the scene for long periods and still retain its full
value as evidence. Other types of evidence are fleeting or highly perishable
and need to either be collected as soon as possible or protected to avoid loss
or change.
Refraction: When light changes from one medium
to another, it will bend. Viewing underwater objects will be affected by
refraction. The result is that objects underwater appear approximately 25%
closer to the viewer than they really are.
Ultraviolet
light: The region
on the electromagnetic spectrum between 100 and 400 nm. It is also sometimes
divided into long, medium, and short wave ultraviolet light (UV). At times, it
is thought of as UVA, UVB, or UVC.
Visible
light: The range on
the electromagnetic spectrum between 400 and 700 nanometers (nm). A nanometer
is one billionth of a meter.
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