Written Laser Hair Removal Practice Exam 2025 – All-in-One Guide to Master Your Certification!

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What does Thermal Relaxation Time (TRT) measure?

Time to reach peak temperature

Time to cool down

Time to lose 50% of heat

Thermal Relaxation Time (TRT) measures the time it takes for a material to lose 50% of its acquired heat. This property is essential in laser hair removal to understand how quickly the target tissue will cool down after being heated by the laser. Options A, B, and D are not correct because they refer to different aspects of temperature change or behavior, which are not directly related to the concept of Thermal Relaxation Time.

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Time to double the temperature

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