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All Journal Jurnal Pendidikan Fisika dan Teknologi Jurnal Penelitian Fisika dan Terapannya (JUPITER)
Widyaputri, Mutya Ardha
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Education Physics

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Analysis of the Impact of Radiation and Albedo on Variations in Earth's Surface Temperature Nurfaizah, Dwi Ayu; Dahliani, Eka; Widyaputri, Mutya Ardha
Jurnal Penelitian Fisika dan Terapannya (JUPITER) Vol. 7 No. 1 (2025): Jurnal Penelitian Fisika dan Terapannya (JUPITER)
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/jupiter.v7i1.18574

Abstract

Solar radiation reaching the Earth is partially absorbed by the surface and partially reflected back into the atmosphere as shortwave and longwave radiation. This study aims to analyze the impact of radiation and albedo on variations in Earth’s surface temperature. The experimental procedure involved exposing different surface types—soil, water, and rock—to light for 20 minutes and then observing their behavior without light for another 20 minutes. The results indicate that low-albedo surfaces absorb more radiation, leading to a temperature increase of 3°C, from 26°C to 29°C. Medium-albedo surfaces, such as rock, experienced a similar temperature rise of 3°C (from 28°C to 31°C), whereas high-albedo surfaces, such as water, showed only a 1°C increase (from 27°C to 28°C). These findings highlight the significant role of albedo in regulating surface temperature fluctuations. Surfaces in high-albedo areas tend to cool more rapidly than those in low-albedo regions. This demonstrates that albedo directly influences radiation absorption and temperature change, making it an effective instructional example for understanding physical concepts such as heat transfer and energy balance at the Earth’s surface.
PBL Student Worksheet with PhET Simulations: Improving Cognitive Learning Outcomes on Simple Machines Widyaputri, Mutya Ardha; Wilujeng, Insih; Rahmawati, Laifa
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 11 No 1a (2025): Special Issue
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v11i1a.9360

Abstract

This study aims to analyze the cognitive learning outcomes of students before and after using PBL student worksheets assisted by PhET Simulations on simple aircraft material. This study used a quasi-experimental method with a one-group pretest-posttest design. The research subjects were 32 students of class VIII H at SMPN X Yogyakarta in the odd semester of the 2023/2024 school year which was determined by purposive sampling technique. The instrument used was a multiple choice test of 15 items that measured cognitive learning outcomes based on Bloom's cognitive taxonomy levels C2, C3, C4. The results showed a significant increase in the cognitive learning outcomes of students before and after using PBL student worksheets assisted by PhET Simulations on simple aircraft material. The pretest average score of 61.97 increased to 84.41 on the posttest, exceeding the minimum completeness criteria. The normality test shows that the data is normally distributed. The paired sample t-test produced a significance value of 0.000 (p < 0.05), which showed a significant difference between the pretest and posttest. The effect size value of 1.73 is in the large category, indicating a strong influence of the treatment on students' cognitive learning outcomes
Co-Authors Dahliani, Eka Insih Wilujeng Laifa Rahmawati, Laifa Nurfaizah, Dwi Ayu