Infrared Training Center Level 1 Practice Exam

How does sandblasting a smooth, shiny metal surface affect the emissivity of that surface?

Reduces it Has no effect Raises it Makes it zero

Correct Answer:

Raises it

Explanation:

Emissivity describes how efficiently a surface radiates infrared energy compared to a perfect blackbody. A smooth, shiny metal reflects most of the IR, so its absorptivity—and thus emissivity—are low. Sandblasting roughens the surface, creating microfacets and pits that trap light and reduce specular reflection. With more of the incident IR energy absorbed, the surface behaves more like a blackbody, so emissivity increases. It won’t become zero, and the texturing does have an effect, so raising emissivity is the best description.

Access more questions from this quiz

Continue to Infrared Training Center Level 1 Practice Exam for more practice questions and the full quiz experience.

Access More Questions