N3 LASER SAFETY EXAM QUESTIONS AND ANSWERS 100%
SOLVED
Class 3b lasers power of - ----Answers---500 mW or less for
less than .25s, or radiant exposure of 100kJ/m^2 or less for
less than .25s
Class 3b lasers capable of following injuries - ----Answers---
accidental injuries from direct or specularly reflected beam
diffuse laser beam reflections from class 3b are - ----
Answers---not hazardous, but may be so if focused to the eye
with optical instruments
examples of class 3b lasers - ----Answers---therapeutic
laser, acupuncture laser, bio-simulation lasers, military laser
range finders and designator
class 4 lasers are ___-power and ___-risk - ----Answers---
high power, high risk
class 4 lasers are capable of emitting - ----Answers---
ultraviolet, infrared, visible laser radiation exceeding emission
levels for class 3b
class 4 average power output of ___ mW or greater for periods
longer than 0.25 sec, or radiant exposure of ___ kJ/m^2 with
,exposure duration of 0.25s or less - ----Answers---500 mW,
100 kJ/m^2
class 4 lasers can produce a hazardous direct or - ----
Answers---specularly reflected laser beam
class 4 injuries include - ----Answers---fire, skin burn
first working laser is - ----Answers---ruby crystal laser, in
1960
Einstein first introduce what in 1917 - ----Answers---concept
of stimulated emission of radiation by atomic systems
high power laser has led to its use in industrial... - ----
Answers---cutting (300-1500W), drilling, welding (500-600W)
and micro-machining, engraving, communications,
entertainment
low-power industrial lasers used in - ----Answers---
construction alignment, dreding, tunneling, pipe laying, bridge
building, military, scanners, low power entertainment
high-power medical lasers are used in - ----Answers---
surgery, excision, plastic surgery, removal of birthmarks,
obstetrics and gynaecology, burning warts, photo-coagulator
, lower power medical lasers used in - ----Answers---
acupuncture, physiotherapy, cosmetic
what organ of the body most subject to laser damage? - ----
Answers---eye
injury to skin is seldom of concern except - ----Answers---in
dealing with very high-powered lasers
safety guide: laser radiation should be discharged in
background that is - ----Answers---non-reflective, fire
resistant
safety guide: area should be cleared of personnel for a
reasonable distance on ... - ----Answers---all sides of laser
beam
safety guide: warning sign should be attached to laser
equipment in a ... - ----Answers---conspicuous location,
indicating potential eye hazard
safety guide: looking into primary beam should be... - ----
Answers---avoided at all times. Equal care exerted to avoid
specula reflections
safety guide: avoid aiming laser with - ----Answers---eye and
prevent looking along axis of beam
SOLVED
Class 3b lasers power of - ----Answers---500 mW or less for
less than .25s, or radiant exposure of 100kJ/m^2 or less for
less than .25s
Class 3b lasers capable of following injuries - ----Answers---
accidental injuries from direct or specularly reflected beam
diffuse laser beam reflections from class 3b are - ----
Answers---not hazardous, but may be so if focused to the eye
with optical instruments
examples of class 3b lasers - ----Answers---therapeutic
laser, acupuncture laser, bio-simulation lasers, military laser
range finders and designator
class 4 lasers are ___-power and ___-risk - ----Answers---
high power, high risk
class 4 lasers are capable of emitting - ----Answers---
ultraviolet, infrared, visible laser radiation exceeding emission
levels for class 3b
class 4 average power output of ___ mW or greater for periods
longer than 0.25 sec, or radiant exposure of ___ kJ/m^2 with
,exposure duration of 0.25s or less - ----Answers---500 mW,
100 kJ/m^2
class 4 lasers can produce a hazardous direct or - ----
Answers---specularly reflected laser beam
class 4 injuries include - ----Answers---fire, skin burn
first working laser is - ----Answers---ruby crystal laser, in
1960
Einstein first introduce what in 1917 - ----Answers---concept
of stimulated emission of radiation by atomic systems
high power laser has led to its use in industrial... - ----
Answers---cutting (300-1500W), drilling, welding (500-600W)
and micro-machining, engraving, communications,
entertainment
low-power industrial lasers used in - ----Answers---
construction alignment, dreding, tunneling, pipe laying, bridge
building, military, scanners, low power entertainment
high-power medical lasers are used in - ----Answers---
surgery, excision, plastic surgery, removal of birthmarks,
obstetrics and gynaecology, burning warts, photo-coagulator
, lower power medical lasers used in - ----Answers---
acupuncture, physiotherapy, cosmetic
what organ of the body most subject to laser damage? - ----
Answers---eye
injury to skin is seldom of concern except - ----Answers---in
dealing with very high-powered lasers
safety guide: laser radiation should be discharged in
background that is - ----Answers---non-reflective, fire
resistant
safety guide: area should be cleared of personnel for a
reasonable distance on ... - ----Answers---all sides of laser
beam
safety guide: warning sign should be attached to laser
equipment in a ... - ----Answers---conspicuous location,
indicating potential eye hazard
safety guide: looking into primary beam should be... - ----
Answers---avoided at all times. Equal care exerted to avoid
specula reflections
safety guide: avoid aiming laser with - ----Answers---eye and
prevent looking along axis of beam
