Sources of Light: Continuous vs Short Duration

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What was discovered in the 1970's regarding the use of lasers?

Lasers are a form of coherent light

Lasers could be used to detect latent fingerprints on rough surfaces

Lasers could be used as an inexpensive alternative to forensic light sources

Illuminating certain items with lasers would cause them to fluoresce or stand out in contrast (correct)

What is an Alternative Light Source (ALS)?

A type of forensic light source that uses white light with filters to search for latent fingerprints

Another term for a forensic light source (FLS)

A more expensive alternative to forensic lasers developed in the mid-1980s

A type of forensic light source that uses a variety of band pass filters to provide a high intensity beam of non-coherent light (correct)

What is a Forensic Light Source (FLS)?

A type of light source that uses lasers to illuminate items and cause them to fluoresce

An inexpensive light source that filters white light to enable the search for latent fingerprints on rough surfaces (correct)

Another term for an Alternative Light Source (ALS)

A more expensive light source used in forensics that is an alternative to lasers

What is the relationship between lasers and coherent light?

Coherent light is a type of laser light Signup and view all the answers

Which of the following is NOT a type of forensic light source mentioned in the text?

Ultraviolet lamp Signup and view all the answers

What is the process called when an object converts one wavelength of radiant energy to another wavelength?

Luminescence Signup and view all the answers

What is the difference between fluorescence and phosphorescence?

Fluorescence only occurs when the energy source is present, while phosphorescence continues after the energy source is removed. Signup and view all the answers

What is the range of wavelengths that our eyes perceive as white light?

400-700 nanometers Signup and view all the answers

What happens when a narrow beam of white light is passed through a prism?

The light bends and spreads out into the visible spectrum of colors. Signup and view all the answers

What is the key difference between the subtractive and additive color systems?

Subtractive color uses pigments, while additive color uses light. Signup and view all the answers

Which color system describes how we see color in paints?

Subtractive color system Signup and view all the answers

Which of the following is NOT an artificial source of continuous radiation?

Sunlight Signup and view all the answers

What is a key advantage of using a short duration (flash unit) light source?

It is lightweight and battery-powered. Signup and view all the answers

Which type of ultraviolet (UV) lamp is used for sterilizing air and work areas?

Short wave UV Signup and view all the answers

What does the acronym 'LASER' stand for?

Light through Simulated Radiation Signup and view all the answers

Which type of ultraviolet (UV) lamp is commonly used for chemical analysis and industrial applications?

Medium wave UV Signup and view all the answers

In a cloudy and dull environment, what is the visibility of distant objects like?

Limited visibility Signup and view all the answers

Sources of Light: Continuous vs Short Duration

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