Laser and Light-Based Hair Removal Physics Exam With 100% Correct Answers 2024

Laser and Light-Based Hair Removal Physics Exam With 100% Correct Answers 2024 What is the acronym for LASER? Light Amplification by Stimulated Emission of Radiation Photothermolysis is based on the principle of using: Laser energy 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? Fluence The principle of selective photothermolysis relies on the presence of what substance in the follicle and surrounding structure? Melanin Laser pulse width represents the: Amount of time the target is exposed to the laser In laser hair removal the most important consideration associated with spot size is the: 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: Thermal relaxation time When excited with a flashlamp the ehe alexandrite crystal emits radiation at: 755nm Select the response with all the correct properties of laser light as it reacts with tissue. -Reflection -Absorption -Transmission -Sccatter Longer laser wavelengths: Penetrate more Permanent hair reduction according to the FDA is defined as? A long term stable reduction in the number of hairs regrowing after a treatment regime In laser hair removal, what need to be damaged in order to prevent further hair growth? Stem cells and dermal papilla Select the wavelength for a long pulsed Ruby laser. 694nm Light waves that travel in perfect unison, parallel, and in the same direction are known as? Coherent light What type of non-laser light is also used for hair removal? Intense pulse light Laser light cannot: Cause intercellular changes in DNA Laser is ineffective on hair that has: Little or no pigment The most common type of laser used for hair removal is? Pulsed Spot size determines: Depth of penetration The wavelength most effective for laser hair removal falls between: 755-1064nm In order to localize the thermal effects, the fluence is typically delivered: With a certain amount of energy The Grothus-Draper Law states that in order for tissue to be affected by laser, there must be: Light absorption A nanometer is: One billionth of a meter This person is responsible for the theory of selective photothermolysis: Rox Anderson This is the process by which a molecule emits two photons pf light after absorbing on and electrons are repeated stimulated by energy: Stimulated emission