Santika, Fiar, Suyanto, Hery, Trisnawati, Ni Luh, AND Indrayana, I Putu. " Determination of the Optical Band gap Energy from the Extraction and Evaporation of Anthocyanin Compound Sea Lettuce (Ulva Lactuca L.) Using Tauc Plot Method" BULETIN FISIKA [Online], Volume 25 Number 1 (28 February 2024)