©SIRJOEL EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
Laser and light based hair removal physics
Exam Questions And Answers
What is the acronym for LASER?
A. Light Amplification by Stimulated Emission of Radiation
B. Light Amplification by Saturated Emission of Radiation
C. Laser Adjusted by Stimulated Emission of Radiation
D. Laser Amplification by Stimulated Emission of Radiation - Answers✔A. Light Amplification by
Stimulated Emission of Radiation
Photothermolysis is based on the principle of using:
A. A laser to obliterate anything containing melanin
B. The hair as a fiber optic to destroy the root of the hair
C. Laser energy is to selectively destroy a target beneath the surface of the skin
D. Laser energy to target and destroy anything with a blood supply by targeting a chromophore
- Answers✔C. Laser energy is to selectively destroy a target beneath the surface of the skin
The measure of energy density delivered to the tissue expressed in joules per cm2 is called:
A. Fluence
B. Frequency
C. Electron
D. Excited state - Answers✔A. Fluence
The principle of selective photothermolysis relies on the presence of what substance in the
follicle and surrounding structure
A. Melanin
B. Sebum
C. Water
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, ©SIRJOEL EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
D. Blood - Answers✔A. Melanin
Laser pulse width represents the:
A. Diameter of the skin area being targeted
B. Amount of time the target is exposed to the laser
C. Amount of heat generated by the laser
D. Amount of energy required for the laser to destroy tissue - Answers✔B. Amount of time the
target is exposed to the laser
In laser hair removal the. Most important consideration associated with spot size is the:
A. Color of laser light
B. Type of hair that may be treated
C. Type of skin that may be treated
D. Depth of penetration of the energy into the dermis - Answers✔D. Depth of penetration of
the energy into the dermis
The amount of time it takes a substance after heating to return to its normal temperature is
known as:
A. Epidermal cooling
B. Thermal relaxation time
C. Thermal storage coefficient
D. Photodynamic therapy - Answers✔B. Thermal relaxation time
When excited with flashlamp the alexandrite crystal emits radiation at:
A. 532nm
B. 694nm
C. 755nm
D. 585nm - Answers✔C. 755nm
Select the response with the correct properties of laser light as it reacts with tissue:
A. Absorption, scatter, conduction, reflection
B. Reflection, absorption, transmission, scatter
C. Transmission, scatter, ablation, reflection
2|Page
ALL RIGHTS RESERVED.
Laser and light based hair removal physics
Exam Questions And Answers
What is the acronym for LASER?
A. Light Amplification by Stimulated Emission of Radiation
B. Light Amplification by Saturated Emission of Radiation
C. Laser Adjusted by Stimulated Emission of Radiation
D. Laser Amplification by Stimulated Emission of Radiation - Answers✔A. Light Amplification by
Stimulated Emission of Radiation
Photothermolysis is based on the principle of using:
A. A laser to obliterate anything containing melanin
B. The hair as a fiber optic to destroy the root of the hair
C. Laser energy is to selectively destroy a target beneath the surface of the skin
D. Laser energy to target and destroy anything with a blood supply by targeting a chromophore
- Answers✔C. Laser energy is to selectively destroy a target beneath the surface of the skin
The measure of energy density delivered to the tissue expressed in joules per cm2 is called:
A. Fluence
B. Frequency
C. Electron
D. Excited state - Answers✔A. Fluence
The principle of selective photothermolysis relies on the presence of what substance in the
follicle and surrounding structure
A. Melanin
B. Sebum
C. Water
1|Page
, ©SIRJOEL EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
D. Blood - Answers✔A. Melanin
Laser pulse width represents the:
A. Diameter of the skin area being targeted
B. Amount of time the target is exposed to the laser
C. Amount of heat generated by the laser
D. Amount of energy required for the laser to destroy tissue - Answers✔B. Amount of time the
target is exposed to the laser
In laser hair removal the. Most important consideration associated with spot size is the:
A. Color of laser light
B. Type of hair that may be treated
C. Type of skin that may be treated
D. Depth of penetration of the energy into the dermis - Answers✔D. Depth of penetration of
the energy into the dermis
The amount of time it takes a substance after heating to return to its normal temperature is
known as:
A. Epidermal cooling
B. Thermal relaxation time
C. Thermal storage coefficient
D. Photodynamic therapy - Answers✔B. Thermal relaxation time
When excited with flashlamp the alexandrite crystal emits radiation at:
A. 532nm
B. 694nm
C. 755nm
D. 585nm - Answers✔C. 755nm
Select the response with the correct properties of laser light as it reacts with tissue:
A. Absorption, scatter, conduction, reflection
B. Reflection, absorption, transmission, scatter
C. Transmission, scatter, ablation, reflection
2|Page
