iarjelIARJELIARJEL2708-5120https://doi.org/10.47310/iajel.2021.v02i01.024The Influence of Integral Calculus Basic Theorems in Learning Radioactivity Materials Students of Physics Education Umn Al Washliyah Medan.JafriHaryadiDepartment of Physics Education UMN Al-Washliyah, IndonesiaThis study aims to determine the ability of students in mastering the basic theorems of integral calculus, radioactivity material and to determine how much influence the ability of the basic theorems of integral calculus in studying radioactivity material. In collecting the data, a test on the basic theorem of integral calculus and radioactivity was used. The test was given after learning the basic theorems of integral calculus and radioactivity material was completed. To analyze the data in this study using statistical concepts, the steps taken are calculating the normality test, regression linearity test, correlation coefficient, test of the significance of the correlation coefficient and the coefficient to be determined. From the data analysis, it was obtained that the correlation coefficient value = 0.66, the meaning of the correlation coefficient = 5.043 and the coefficient of termination = 0.4356. These results indicate that 43.56% of the variable x can explain the variable y. The data show that there is a significant contribution to the ability of the basic theorem of integral calculus in studying radioactivity material.