Valerie was researching environmental effects with respect to reflected radiation. Which term would Valerie use when describing how to measure the reflectivity of a surface?

The answer is albedo. This, in Latin, means whiteness meaning the measure of diffuse reflection of light of a surface. Albedo scale is 0 - 1 with 0 representing no reflection (black body) while 1 represents a total reflection of incident light. Albedo is used in astronomy and climatology.