N3 Laser Safety UPDATED ACTUAL Exam
Questions and CORRECT Answers
Ionisation - CORRECT ANSWER - Electrical process in which electron is knocked out of
its orbit
Ionising radiation - CORRECT ANSWER - radiation that is energetic and capable of
causing atoms and molecules in its path to split into positive and negative ions
ionising radiation includes - CORRECT ANSWER - alpha, beta and gamma rays
decay of radioactive substances produces what rays - CORRECT ANSWER - alpha, beta
and gamma rays
x-ray machines produce - CORRECT ANSWER - x-rays
particulate radiation consist of ___ and ___ rays - CORRECT ANSWER - alpha, beta
x-rays are electromagnetic radiation of wavelength - CORRECT ANSWER - 100nm to 1e-
5 nm
alpha, beta, gamma rays result from - CORRECT ANSWER - spontaneous re-
arrangements within unstable nuclei
x-rays produced by - CORRECT ANSWER - electroncs jumping between orbits close to
nucleus or electrons losing energy when passing through strong electric field close to nucleus
x-rays are unlike radiation from radioactive sources because - CORRECT ANSWER - they
can be "turned off" by disconnecting high voltage
, alpha and beta are - CORRECT ANSWER - sub-atomic particles
gamma and x-ray are - CORRECT ANSWER - electromagnetic rays
alpha radiation completely absorbed by - CORRECT ANSWER - sheet of paper, few
centimeters of air
beta radiation completely absorbed by - CORRECT ANSWER - few cm of wood, glass,
water or several meters of air
gamma and x-ray intensity reduced significantly by - CORRECT ANSWER - few mm of
lead, few cm of concrete/brick (low energy). 10cm or more of lead, meter or so of concrete/brick
(high energy)
non-ionising radiation refers to radiation which - CORRECT ANSWER - energy not
capable in causing ionistion, but capable in causing other injuries
non-ionising radiation wavelengths - CORRECT ANSWER - greater than 100nm and
acoustic radiation and fields with frequencies above 16 kHz
examples of non-ionising radiation - CORRECT ANSWER - microwave, ultraviolet,
visible, infrared, laser, ultrasound radiation
electromagnetic radiation created by - CORRECT ANSWER - oscillating electric charges
kind of EM radiation emitted is determined by - CORRECT ANSWER - frequency of
oscillation
EM radiation can be considered as a stream of particles called - CORRECT ANSWER -
photons
Questions and CORRECT Answers
Ionisation - CORRECT ANSWER - Electrical process in which electron is knocked out of
its orbit
Ionising radiation - CORRECT ANSWER - radiation that is energetic and capable of
causing atoms and molecules in its path to split into positive and negative ions
ionising radiation includes - CORRECT ANSWER - alpha, beta and gamma rays
decay of radioactive substances produces what rays - CORRECT ANSWER - alpha, beta
and gamma rays
x-ray machines produce - CORRECT ANSWER - x-rays
particulate radiation consist of ___ and ___ rays - CORRECT ANSWER - alpha, beta
x-rays are electromagnetic radiation of wavelength - CORRECT ANSWER - 100nm to 1e-
5 nm
alpha, beta, gamma rays result from - CORRECT ANSWER - spontaneous re-
arrangements within unstable nuclei
x-rays produced by - CORRECT ANSWER - electroncs jumping between orbits close to
nucleus or electrons losing energy when passing through strong electric field close to nucleus
x-rays are unlike radiation from radioactive sources because - CORRECT ANSWER - they
can be "turned off" by disconnecting high voltage
, alpha and beta are - CORRECT ANSWER - sub-atomic particles
gamma and x-ray are - CORRECT ANSWER - electromagnetic rays
alpha radiation completely absorbed by - CORRECT ANSWER - sheet of paper, few
centimeters of air
beta radiation completely absorbed by - CORRECT ANSWER - few cm of wood, glass,
water or several meters of air
gamma and x-ray intensity reduced significantly by - CORRECT ANSWER - few mm of
lead, few cm of concrete/brick (low energy). 10cm or more of lead, meter or so of concrete/brick
(high energy)
non-ionising radiation refers to radiation which - CORRECT ANSWER - energy not
capable in causing ionistion, but capable in causing other injuries
non-ionising radiation wavelengths - CORRECT ANSWER - greater than 100nm and
acoustic radiation and fields with frequencies above 16 kHz
examples of non-ionising radiation - CORRECT ANSWER - microwave, ultraviolet,
visible, infrared, laser, ultrasound radiation
electromagnetic radiation created by - CORRECT ANSWER - oscillating electric charges
kind of EM radiation emitted is determined by - CORRECT ANSWER - frequency of
oscillation
EM radiation can be considered as a stream of particles called - CORRECT ANSWER -
photons
