Covid-19 telah mempengaruhi bidang pendidikan di Indonesia. Pembelajaran fisika yang awalnya dilakukan secara langsung di kelas kini harus melalui daring di rumah. Praktikum juga tidak dapat dilakukan secara langsung di laboratorium nyata. Salah satu media yang dapat digunakan untuk praktikum virtual yaitu PhET Simulation. Tujuan penelitian ini adalah untuk mengetahui tingkat peluruhan isotop Karbon-14 dan Uranium-238 pada waktu paruh pertama, waktu paruh kedua dan waktu paruh ketiga, serta untuk mengetahui tingkat ketelitian percobaan yang dilakukan dengan menggunakan PhET Simulation. Metode yang digunakan dalam penelitian ini adalah metode eksperimen yaitu dengan melakukan praktikum virtual menggunakan PhET Simulation. Hasil penelitian menunjukkan bahwa persentase tingkat peluruhan Karbon-14 pada waktu paruh pertama adalah 49%, pada waktu paruh kedua adalah 75,4%, dan pada waktu paruh ketiga adalah 84,5%. Sementara persentase tingkat peluruhan Uranium-238 pada waktu paruh pertama adalah 49,6%, pada waktu paruh kedua adalah 74%, dan pada waktu paruh ketiga adalah 85,9%. Tingkat ketelitian percobaan pada isotop Karbon-14 dengan menggunakan PhET Simulation sebesar 98,35% sedangkan tingkat ketelitian percobaan pada isotop Uranium-238 sebesar 99,95%. Oleh karena itu, laboratorium virtual PhET Simulation dapat digunakan sebagai solusi praktikum waktu paruh di masa pandemi Covid-19.

Understanding a physics concept requires supporting activities such as practicum. The existence of the Covid-19 Pandemic has caused practicum not to be carried out directly in the laboratory so it is done through virtual laboratory media, one of which is the Crocodile Physics software. However, the use of Crocodile Physics software for prism practicum has not been widely used. Therefore, in this study using Crocodile Physics 605 software which aims to determine the angle of deviation in different prisms and to see the relationship between the angle of incidence and the angle of deviation of the prism. Based on the data analysis that has been carried out, it is found that the benzane medium produces the largest prism deviation angle compared to other mediums, which is 62o. The greater the value of the angle of incidence in the first plane of the prism , the greater the value of the angle of deviation . Vice versa, the smaller the value of the angle of incidence in the first plane of the prism, the smaller the value of the angle of deviation.

This study aims to analyze the effect of the TGT type of cooperative learning model in learning physics through the overall size, based on education level, by region and dependent variables. This study uses a descriptive method with a meta-analysis approach to the results of scientific research published nationally. There are 8 national journals that fall into the research category. The results showed that learning as a whole with the application of the TGT cooperative learning model was able to improve student learning outcomes with an effect size of 0.459 from the control group. Based on the level of education, it can improve student learning outcomes with an effect size of 0.352 for junior high school education and 0.524 for high school education. Based on region, several regions in Indonesia, namely the island of Java, obtained results with an effect size of 0.743 and Sumatra with 0.419. And based on the dependent variable, the TGT cooperative learning relationship with learning outcomes has an effect size of 0.453; learning achievement has an effect size of 0.743; and understanding the concept has an effect size of 0.335. The three results of this study indicate the magnitude of the influence of the TGT type of cooperative learning model in learning physics. This shows that the TGT type of cooperative learning model is effectively used and has a major influence on learning physics.