What determines the chrematistics of a laser?

• A. Color and Size
• B. Brand and Model
• C. Temperature and Humidity
• D. Wavelength and Power

Answer: (D)

Wavelength and power set how a laser interacts with matter. The wavelength determines the photon energy and how strongly the light is absorbed by different materials, which in turn controls penetration depth, heating, and the specific interactions with tissue or surfaces. Power dictates how much energy is delivered per unit time, influencing fluence, heating, and the ability to cause effects like cutting or ablation. The other options don’t define these fundamental interactions: color/size are descriptive traits, temperature and humidity affect the environment rather than the laser’s intrinsic output, and brand/model specifies who makes it rather than how the laser behaves.