ক্ৰিয়া বিভৱক্ৰিয়া-ধৰা
ক্ৰিয়া বৰ্ণালী (Assamese)
1. An action spectrum is a graph of the rate of biological effectiveness plotted against wavelength of light. It is related to absorption spectrum in many systems. Mathematically, it describes the inverse... from wikipedia.org