Jurnal Pendidikan Fisika dan Keilmuan (JPFK)

HOTS Measured by Cognitive Learning Outcomes (CLO) Inventory Based Education for Sustainable Development as a Media for Students Skills Analysis

2024-08-20T18:41:44+07:00

This study aims to develop an ESD-based cognitive learning outcomes instrument in measuring students' higher order thinking skills. This research is a R&D. The data in this study are qualitative and quantitative data from limited trials to fifty twelfth grade students. Quantitative data were analysed using SPSS and Rasch model, the results of validity analysis using SPSS and Rasch model showed nine items on the instrument, except item number 1 is valid because it has met 1 of the 3 criteria for item fit order following 0.50 < MNSQ < 1.5; -2.0 < ZSTD < +0.2 and 0.4 < Pt Mean < 0.85. The results of instrument reliability analysis using SPSS showed 0.716 while person reliability and item reliability from Rasch analysis showed 0.64 and 0.77 respectively. Analysis of students' worksheets shows that the presentation of students' answers is still in an incorrect position so it concluded that students have not been able to link the real experiences they have with issues that occur in the real world, besides that the results of the analysis of students' worksheets also show that more than 45% of students are still at a low level of thinking, especially on issues related to SDGâ€™s.

Identification Of Sub-Surface Rock Structures In The Banyu Biru Hot Springs Area Using The Gravity Method

2024-08-20T18:41:45+07:00

One of the geothermal manifestations in Nganjuk is the Banyu Biru hot spring in Gondangwetan Village, Jatikalen District, Nganjuk regency. This hot spring was discovered by accident when drilling a well to be used as a rice field flow, but the water that came out was hot water with a temperature of 37 oC at a depth of 250-300 m. This study aims to determine local anomaly patterns and lithological structures of subsurface rocks in the Jatikalen hot spring area. The research method used is the gravity method based on GGMPlus satellite data obtained as many as 100 data with a distance of 200 m between points. Based on the qualitative analysis of the local anomaly contours, the low anomaly was -2.6 mGal to -0.8 mGal, the moderate anomaly was -0.6 mGal to 2.2 mGal, and the high anomaly was 0.6 mGal â€“ 2.2 mGal. Quantitative interpretation with the results of the cross-sectional model resulted in 5 layers of topsoil with a density value of 1.2 grams/cm³. In the second layer is alluvium in the form of gravel, gravel, sand with a density of 1.7 grams/cm3. The third layer is tuffaceous clay with a density of 2 grams/cm3 and the fourth layer is calcareous tuff with a density value of 2.67 grams/cm³. While the last in the fifth layer is breccia rock with a density value of 3 grams/cm³.

Analysis of Students' Cognitive Structure through the Assimilation and Accommodation Framework on Work and Energy Material

2024-08-20T18:41:46+07:00

This study aims to find out how the cognitive structure and problem-solving of high school students in business materials and energy based on the framework of assimilation and accommodation. The method used is a mixed research method with an explanatory sequential design. Data collection was carried out on 53 students in class X using diagnostic test instruments in a five-tier format, then continued with the provision of description tests and interviews to three research subjects with different comprehension categories. The test results showed that students' understanding of concepts was 30.2% in the energy change sub-material, and 52.8% in the non-understanding of concepts in the relationship between potential, kinetic and mechanical energy. Meanwhile, the misconception of the concept was known at 23.6% where students considered the amount of effort to depend on the length of the trajectory taken. Solving problems of subjects with different comprehension categories showed that all three subjects had a less coherent local cognitive structure. Subjects with a conceptual understanding category (S3) have a better assimilation process than subjects with a non-conceptual category (S2). However, it was found that there were subjects with a misconception category (S1) who could solve problems through the assimilation process from beginning to end, this shows that the assimilation process can occur when the subject has the same knowledge scheme as the problem at hand. The accommodation process shows that the subject has a different knowledge scheme with new information/problems faced, especially in mathematical calculations and foreign terms. This is due to associative thinking, intuition and incomplete reasoning.

Analysis of Students' Problem-Solving Abilities in Learning with an Ethnoscience-Based Socio-Scientific Issues (SSI) Approach

2024-08-20T18:41:46+07:00

Ethnoscience-based learning is limited to constructing community knowledge into scientific knowledge, it needs to be directed at solving problems that occur in local potential/culture. The research aims to analyze students' problem-solving abilities in learning using the Ethnoscience Based Socio Scientific Issues (SSI) Approach. The research uses a quantitative approach, true experimental method, and pretest-posttest control group design type. The research sample was taken using the simple random sampling method. Problem-solving ability is measured using description questions and analyzed using a percentage scale. To see the difference in problem-solving abilities between the experimental class and the control class, the t-test was used and to see how big the difference was, the Gain test was used. The research results showed that 81% of students' problem-solving abilities were in the good category. The results of the t-test show that there is a difference in problem-solving abilities between classes that apply the ethnoscience-based Socio Scientific Issues (SSI) approach and those that do not, as indicated by the t_count of 7.396 which is greater than the t_table of 2.045. The difference in students' problem-solving abilities is 0.74 in the high category. The impact of being trained in the stages of problem-solving on each topic of local problems, students have good problem-solving abilities.

Spectrum of kinetic energy of electrons of Helium ions in functions Radial Schrodinger waves on quantum numbers (n â‰¤ 3)

2024-08-20T18:41:47+07:00

The Schrodinger equation is an equation that describes the properties of a wave. The Schrodinger equation is solved using a variable separation method that produces a wave function. The wave function using the variable separation method is divided into 2 parts, namely the radial part and the angular part. The energy spectrum states the energy levels of electrons. Energy spectrum and wave function are related to each other. The energy level in the Schrodinger wave function in the form of kinetic energy is the energy for electrons to move from one point to another. The research aims to describe the kinetic energy spectrum of electrons in the radial wave function. The type of research used is basic research, namely the development of existing theories. The result obtained is a radial wave function with a certain quantum number n and an integrated Laplace constant that can produce electron kinetic energy, namely by integrating the wave function with each quantum number. The kinetic energy has its own value according to the quantum number. Kinetic energy in quantum numbers (n = 1,l = 0, Ek =171.18 eV ; n =2,l = 0, Ek =399.09 eV n =2,l = 1, Ek =152.16 eV n =3,l = 0, Ek =5096.81 eV n =3,l = 1, Ek =81142.43 eV n =3,l = 2, Ek =21.979 eV). The conclusion of this research is that the kinetic energy spectrum of electrons produces a directly proportional relationship to the quantum number n, where the greater the quantum number n, the greater the spectrum or kinetic energy level of the electron.

The Effect Of Annealing Temperature On The Properties Of Thin Zno Films Deposited Using Microwave-Assisted Spray Pyrolysis System

2024-08-20T18:41:48+07:00

This research aims to determine the optimal annealing temperature for the production of ZnO thin films using the microwave-assisted spray pyrolysis method. In the ZnO growth process, a high microwave temperature was used, with a spray pressure of 20 kg/m2, a nozzle distance of 12 cm, 3 layers, a spray duration of 5 seconds, and a 1-minute interval between layers. Annealing temperature variations included 300Â°C, 350Â°C, 400Â°C, 450Â°C, 500Â°C, 550Â°C, and 600Â°C. SEM results indicated that the best morphology was achieved at 400Â°C, with the smoothest and least cracked surface. EDX results showed the highest ZnO composition percentage at 450Â°C, which was 93.61%.The optical properties obtained from UV-Vis spectroscopy revealed the lowest absorption in the visible light wavelength range (400-700 nm) at an annealing temperature of 450Â°C. Furthermore, the highest transmittance and the lowest bandgap were observed at an annealing temperature of 450Â°C, measuring 90.77% and 3.00 eV, respectively. Crystal property analysis from XRD data revealed that all samples had a hexagonal wurtzite structure. The best crystal index was achieved at 450Â°C, with a value of 81.899%. Increasing the annealing temperature improved the crystal properties, as evidenced by a decreasing full width half maximum (FWHM) until 450Â°C, which was 0.476Â°.

Uncertainty of Helium Ion Momentum (ð‘¯ð’†+) by Using the Heisenberg Uncertainty Approach on Quantum Numbers ð’ â‰¤ ðŸ‘

2024-08-20T18:41:49+07:00

This study aims to find the uncertainty value of Helium Ion Momentum (ð»ð‘’+) by using the Heisenberg Uncertainty Approach to Quantum Numbers ð‘› â‰¤ 3. This type of research uses non-experimental research. The research was conducted by developing previously existing theories. This research is to calculate the expectation value of the position to find out how often electrons can appear, and determine the uncertainty of the momentum of Helium Ion (ð»ð‘’+) by using the Heisenberg uncertainty approach at number ð‘› â‰¤ 3. Based on the results and discussion, it can be concluded that the uncertainty of helium ion momentum (ð»ð‘’+) by using the Heisenberg uncertainty approach to quantum numbers ð‘› â‰¤ 3. The uncertainty of helium ion momentum is influenced by the main quantum number (n) and the azimuthal quantum number (l). By entering the values of n and l, the results can be obtained at quantum numbers ð‘› = 1 with ð‘™ = 0 obtained âˆ†ð‘ƒð‘Ÿ = 2,977504663 Ã— 10âˆ’24. At the quantum number ð‘› = 2 with ð‘™ = 0 obtained âˆ†ð‘ƒð‘Ÿ = 8,06312759 Ã— 10âˆ’24 and ð‘™ = 1 obtained âˆ†ð‘ƒð‘Ÿ = 2,03048 Ã— 10âˆ’23. At the quantum number ð‘› = 3 with ð‘™ = 0 obtained âˆ†ð‘ƒð‘Ÿ = 1,50366086 Ã— 10âˆ’23, and ð‘™ = 1 obtained âˆ†ð‘ƒð‘Ÿ = 3,481407588 Ã— 10âˆ’23 and ð‘™ = 2 obtained âˆ†ð‘ƒð‘Ÿ = 4,47363642 Ã— 10âˆ’22. Based on these results, it can be concluded that the uncertainty value of momentum is getting bigger as the two values of n and l increase. This is also proven by using simulation and the results of momentum uncertainty are not much different and only a difference of a few decimal places.