N3 Laser Safety Exam Questions and
Answers 100% Solved
Ionisation - ✔✔Electrical process in which electron is knocked out of its orbit
Ionising radiation - ✔✔radiation that is energetic and capable of causing atoms
and molecules in its path to split into positive and negative ions
ionising radiation includes - ✔✔alpha, beta and gamma rays
decay of radioactive substances produces what rays - ✔✔alpha, beta and
gamma rays
x-ray machines produce - ✔✔x-rays
particulate radiation consist of ___ and ___ rays - ✔✔alpha, beta
x-rays are electromagnetic radiation of wavelength - ✔✔100nm to 1e-5 nm
alpha, beta, gamma rays result from - ✔✔spontaneous re-arrangements within
unstable nuclei
x-rays produced by - ✔✔electroncs jumping between orbits close to nucleus or
electrons losing energy when passing through strong electric field close to
nucleus
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©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
, x-rays are unlike radiation from radioactive sources because - ✔✔they can be
"turned off" by disconnecting high voltage
alpha and beta are - ✔✔sub-atomic particles
gamma and x-ray are - ✔✔electromagnetic rays
alpha radiation completely absorbed by - ✔✔sheet of paper, few centimeters of
air
beta radiation completely absorbed by - ✔✔few cm of wood, glass, water or
several meters of air
gamma and x-ray intensity reduced significantly by - ✔✔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 - ✔✔energy not capable in
causing ionistion, but capable in causing other injuries
non-ionising radiation wavelengths - ✔✔greater than 100nm and acoustic
radiation and fields with frequencies above 16 kHz
examples of non-ionising radiation - ✔✔microwave, ultraviolet, visible, infrared,
laser, ultrasound radiation
electromagnetic radiation created by - ✔✔oscillating electric charges
Page 2 of 14
©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
Answers 100% Solved
Ionisation - ✔✔Electrical process in which electron is knocked out of its orbit
Ionising radiation - ✔✔radiation that is energetic and capable of causing atoms
and molecules in its path to split into positive and negative ions
ionising radiation includes - ✔✔alpha, beta and gamma rays
decay of radioactive substances produces what rays - ✔✔alpha, beta and
gamma rays
x-ray machines produce - ✔✔x-rays
particulate radiation consist of ___ and ___ rays - ✔✔alpha, beta
x-rays are electromagnetic radiation of wavelength - ✔✔100nm to 1e-5 nm
alpha, beta, gamma rays result from - ✔✔spontaneous re-arrangements within
unstable nuclei
x-rays produced by - ✔✔electroncs jumping between orbits close to nucleus or
electrons losing energy when passing through strong electric field close to
nucleus
Page 1 of 14
©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
, x-rays are unlike radiation from radioactive sources because - ✔✔they can be
"turned off" by disconnecting high voltage
alpha and beta are - ✔✔sub-atomic particles
gamma and x-ray are - ✔✔electromagnetic rays
alpha radiation completely absorbed by - ✔✔sheet of paper, few centimeters of
air
beta radiation completely absorbed by - ✔✔few cm of wood, glass, water or
several meters of air
gamma and x-ray intensity reduced significantly by - ✔✔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 - ✔✔energy not capable in
causing ionistion, but capable in causing other injuries
non-ionising radiation wavelengths - ✔✔greater than 100nm and acoustic
radiation and fields with frequencies above 16 kHz
examples of non-ionising radiation - ✔✔microwave, ultraviolet, visible, infrared,
laser, ultrasound radiation
electromagnetic radiation created by - ✔✔oscillating electric charges
Page 2 of 14
©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
