Laser test Exam ACTUAL QUESTIONS
AND CORRECT ANSWERS
The term "LASER" is an acronym for: - CORRECT ANSWER light amplification by
stimulated emission of radiation
The very first therapeutic laser (of any class) received 510k market clearance from the United
States Food and Drug Administration (FDA) in _____.And the first class 4 therapy laser
gained FDA clearance in _____. - CORRECT ANSWER 2002 , 2003
In the late 1960's he made the observation that the hair of shaved mice grew back more
rapidly after exposure to low power laser light. As a result he is known as the 'Father of Laser
Therapy'. Who is he? - CORRECT ANSWER Dr. Endre Mester
In 2015 a world-wide panel of experts designated the term ____________ to describe the
therapeutic use of light. - CORRECT ANSWER photobiomodulation, or PBM
Surgical lasers cut tissue; and are used for performing surgery, removal of 'lumps and bumps',
and other ablative laser procedures. What is the mechanism of action for surgical lasers? -
CORRECT ANSWER Photothermal: the laser light has a very high power density and
causes excessive heating of water molecules, which vaporizes the water, "explodes" the cells,
and thus cuts the tissue.
Therapeutic lasers help to enhance tissue healing, and are used for pain management, wound
and injury healing, and other uses. What is the mechanism of action for therapeutic lasers? -
CORRECT ANSWER Both A and C are correct (Photochemical and
Photobiostimulative)
Wavelength measures the distance between two corresponding points on adjacent light
waves, for example from one peak to the next, or from one trough to the next. Which is the
proper unit for measuring wavelength? - CORRECT ANSWER nanometers (nm)
t or f- Compared to healthy cells, compromised or unhealthy cells in tissues that are injured
or damaged are more 'reduced'. This means that damaged cells will more readily absorb
, oxygen; and therefore damaged tissues will respond more readily to laser therapy. -
CORRECT ANSWER true
t or f- The "electromagnetic spectrum" is used to describe the entire range of radiation -
including gamma rays, x-rays, ultraviolet, visible light, infrared, microwaves, and radio
waves. Therefore, it is appropriate to refer to all of these as "electromagnetic radiation". -
CORRECT ANSWER true
t or f- Power is the rate of energy delivery, and Power = Energy ÷ Time (Power equals energy
divided by time)
Proper units are: 1 Watt = 1 Joule ÷ 1 second. (One Watt equals one Joule per second.) -
CORRECT ANSWER true
Photons of laser light are absorbed by water molecules, hemoglobin, mitochondrial enzymes
and other tissue components. The general name for these components is _______________. -
CORRECT ANSWER chromophores
When therapeutic laser light is absorbed by enzymes in the mitochondria the result is an
increase in the production of ________, which leads to normalization of cell function, pain
relief, and healing. - CORRECT ANSWER adenosine tri-phosphate (ATP)
t or f- The Platinum 4 therapeutic laser delivers these wavelengths: 650, 810, 915 & 980
nanometers; and the H1 delivers these wavelengths: 650, 810 & 915 nanometers. -
CORRECT ANSWER true
The level of laser radiation to which a person may be exposed without hazardous effects or
adverse biological changes in the eye or skin is the _____. - CORRECT
ANSWER Maximum Permissible Exposure (MPE)
___________ is one of the unique properties of laser light. It arises from the stimulated
emission process which provides the amplification. Since a common stimulus triggers the
emission events which provide the amplified light, the emitted photons are "in step" and have
a definite phase relation to each other. - CORRECT ANSWER Coherence
AND CORRECT ANSWERS
The term "LASER" is an acronym for: - CORRECT ANSWER light amplification by
stimulated emission of radiation
The very first therapeutic laser (of any class) received 510k market clearance from the United
States Food and Drug Administration (FDA) in _____.And the first class 4 therapy laser
gained FDA clearance in _____. - CORRECT ANSWER 2002 , 2003
In the late 1960's he made the observation that the hair of shaved mice grew back more
rapidly after exposure to low power laser light. As a result he is known as the 'Father of Laser
Therapy'. Who is he? - CORRECT ANSWER Dr. Endre Mester
In 2015 a world-wide panel of experts designated the term ____________ to describe the
therapeutic use of light. - CORRECT ANSWER photobiomodulation, or PBM
Surgical lasers cut tissue; and are used for performing surgery, removal of 'lumps and bumps',
and other ablative laser procedures. What is the mechanism of action for surgical lasers? -
CORRECT ANSWER Photothermal: the laser light has a very high power density and
causes excessive heating of water molecules, which vaporizes the water, "explodes" the cells,
and thus cuts the tissue.
Therapeutic lasers help to enhance tissue healing, and are used for pain management, wound
and injury healing, and other uses. What is the mechanism of action for therapeutic lasers? -
CORRECT ANSWER Both A and C are correct (Photochemical and
Photobiostimulative)
Wavelength measures the distance between two corresponding points on adjacent light
waves, for example from one peak to the next, or from one trough to the next. Which is the
proper unit for measuring wavelength? - CORRECT ANSWER nanometers (nm)
t or f- Compared to healthy cells, compromised or unhealthy cells in tissues that are injured
or damaged are more 'reduced'. This means that damaged cells will more readily absorb
, oxygen; and therefore damaged tissues will respond more readily to laser therapy. -
CORRECT ANSWER true
t or f- The "electromagnetic spectrum" is used to describe the entire range of radiation -
including gamma rays, x-rays, ultraviolet, visible light, infrared, microwaves, and radio
waves. Therefore, it is appropriate to refer to all of these as "electromagnetic radiation". -
CORRECT ANSWER true
t or f- Power is the rate of energy delivery, and Power = Energy ÷ Time (Power equals energy
divided by time)
Proper units are: 1 Watt = 1 Joule ÷ 1 second. (One Watt equals one Joule per second.) -
CORRECT ANSWER true
Photons of laser light are absorbed by water molecules, hemoglobin, mitochondrial enzymes
and other tissue components. The general name for these components is _______________. -
CORRECT ANSWER chromophores
When therapeutic laser light is absorbed by enzymes in the mitochondria the result is an
increase in the production of ________, which leads to normalization of cell function, pain
relief, and healing. - CORRECT ANSWER adenosine tri-phosphate (ATP)
t or f- The Platinum 4 therapeutic laser delivers these wavelengths: 650, 810, 915 & 980
nanometers; and the H1 delivers these wavelengths: 650, 810 & 915 nanometers. -
CORRECT ANSWER true
The level of laser radiation to which a person may be exposed without hazardous effects or
adverse biological changes in the eye or skin is the _____. - CORRECT
ANSWER Maximum Permissible Exposure (MPE)
___________ is one of the unique properties of laser light. It arises from the stimulated
emission process which provides the amplification. Since a common stimulus triggers the
emission events which provide the amplified light, the emitted photons are "in step" and have
a definite phase relation to each other. - CORRECT ANSWER Coherence
