Written Laser Hair Removal Practice Exam 2026 - Free Laser Hair Removal Practice Questions and Study Guide

A joule is a unit of energy or work, which is the amount of force needed to move an object over a certain distance. Power (A) is the rate at which work is done or energy is transferred. Frequency (B) is the number of occurrences of a repeating event per unit of time. Intensity (D) is the amount of energy transferred per unit of area. Therefore, these options are not correct as they do not accurately describe what a joule is a unit of.