Garuda - Garba Rujukan Digital

Subaer Subaer

Unknown Affiliation

Author-ID : 386847

Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics

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Development and Students’ Perception on Teaching Aids of Photoelectric Effect Experiment Using Leds Hartono Bancong; Ana Dhiqfaini Sultan; Subaer Subaer; Muris Muris
Jurnal Pendidikan Fisika Vol 7, No 3 (2019): PENDIDIKAN FISIKA
Publisher : Universitas Muhammadiyah Makassar

The photoelectric effect experiment generally uses a very sophisticated and expensive apparatus. Some high schools and even universities in Indonesia cannot afford to conduct this experiment because of the high price of the apparatus. The purpose of this study was to develop a user-friendly, and cost-effective teaching aids which can be used to demonstrate the concepts of modern physics related to the photoelectric effect. The stages of this study employed the Four-D model, namely define, design, develop, and disseminate. Based on experts and practitioner evaluation, the developed teaching aids and practicum devices of photoelectric effect experiment were found to be valid and reliable. The results of the experiment by using this developed teaching aids of the photoelectric effect showed that there is a linear relationship between the stopping potential and the frequency of light emitted by the LED. These results are consistent with Millikan's experimental results, the first physicist who succeed in proving Einstein's hypothesis of the photoelectric effect, that in the photoelectric effect the stopping potential does not depend on the intensity of light but depends only on the frequency of light. In this study, the Planck’s constant value obtained is 6.408x10-34 J.s. Although this value is slightly smaller than the accepted value of Planck's constant that is 6.626x10-34 J.s, it is good enough considering the instrumental error occurred during the measurement of current and voltage. Furthermore, the students’ perception of the developed teaching aids and practicum devices of the photoelectric effects experiment are 74.9% (good) and 80.2% (very good), respectively. This indicates that the photoelectric effect experiment teaching aids and practicum devices that have been developed can be used to demonstrate and prove the concepts of modern physics related to the photoelectric phenomena correctly.Keywords: Teaching Aids, Photoelectric Effect, Students’ Perception

The Development of Physics Teaching Aids to Demonstrate the Intensity of Blackbody Radiation As a Function of Temperature Hartono Bancong; Ana Dhiqfaini Sultan; Subaer Subaer; Muris Muris
Jurnal Pendidikan Fisika Vol 7, No 1 (2019): PENDIDIKAN FISIKA
Publisher : Universitas Muhammadiyah Makassar

The purpose of this study was to develop teaching aids of blackbody radiation experiment and practicum devices based on modified free inquiry which are valid and reliable. This teaching aids was designed to demonstrate the relationship between the intensity of radiation and the absolute temperature of a blackbody (the law of Stefan-Boltzmann). The principle of this experiments is the amount of current will flow from the voltage source and enter to the black box. The black box will absorb and emit radiation. There is a nichrome wire inside the black box that will be light up, heat and emit radiation when electrically flowed. The emitted heat will be measured by temperature sensors using thermocouple located outside the black box. Based on experts and practitioner evaluation, the developed teaching aids of blackbody radiation experiment and practicum devices based on modified free inquiry were found to be valid, and reliable. The results of the experiment showed that the intensity of blackbody radiation was directly proportional to its temperature. This result is consistent with the law of Stefan-Boltzmann. Furthermore, the average of students’ perception of the developed teaching aids and practicum devices of blackbody radiation are 74.92% (good) and 80.17% (very good) respectively. This indicates that the teaching aids and practicum devices that have been developed can be used to demonstrate and prove the modern physics concepts related to blackbody radiation.Keywords: Teaching Aids, Stefan-Boltzmann’s law, Blackbody RadiationPenelitian ini bertujuan untuk mengembangan alat peraga eksperimen radiasi benda hitam dan perangkat praktikum fisika berbasis modified free inquiry yang valid dan reliabel. Alat peraga tersebut dirancang untuk mendemonstrasikan hubungan antara intensitas radiasi benda hitam dengan suhu mutlak yang dipancarkannya (Hukum Stefan-Boltzmann). Prinsip kerja dari alat peraga tersebut adalah arus akan mengalir dari sumber tegangan dan masuk ke dalam kotak lubang hitam. Kotak ini berfungsi untuk menyerap dan memancarkan radiasi. Di dalam kotak terdapat kawat nicrom yang akan menyala dan memancarkan radiasi ketika dialiri arus listrik. Panas yang dipancarkan akan diukur oleh termokopel radiasi yang berada di luar kotak. Berdasarkan penilaian validator, alat peraga eksperimen radiasi benda hitam dan perangkat praktikum fisika berbasis modified free inquiry yang telah dikembangkan dinyatakan valid dan reliabel. Hasil uji coba menunjukkan bahwa intensitas radiasi yang dipancarkan oleh benda hitam berbanding lurus dengan temperaturnya yang sesuai dengan hukum Stefan-Boltzmann. Selanjutnya, rata-rata persepsi praktikan terhadap alat peraga eksperimen radiasi benda hitam dan perangkat praktikum yang telah dikembangkan secara berturut-turut adalah 74,92% (baik) dan 80,17% (sangat baik). Hal ini mengindikasikan bahwa alat peraga dan perangkat praktikum yang telah dikembangkan dapat digunakan untuk mendemonstrasikan dan membuktikan konsep-konsep fisika modern yang berhubungan dengan radiasi benda hitam.Kata kunci: Alat Peraga, Hukum Stefan-Boltzmann, Radiasi Benda Hitam

STUDI TENTANG PENGARUH NANOPARTIKEL ZnO TERHADAP SOLIDIFIKASI DAN WAKTU SETTING GEOPOLIMER BERBAHAN DASAR METAKAOLIN Subaer Subaer; Nurhayati Nurhayati; A. Irhamsyah; Nurfadil Nurfadil
Indonesian Journal of Fundamental Sciences Vol 1, No 1 (2015)
Publisher : Universitas Negeri Makassar

Telah dilakukan penelitian untuk mempelajari pengaruh nanopartikel ZnO terhadap solidifikasi dan waktu setting geopolimer berbahan dasar metakaolin. Nanopartikel ZnO disintesis melalui metode presipitasi hidrotermal kristal ZnSO4. Ukuran rata-rata partikel ZnO berdasarkan pengukuran dengan X-Ray Diffraction (XRD) sebesar 28 nm. Geopolimer disintesis dengan metode aktivasi alkali metakaolin dan curing pada suhu 70oC dan dengan penambahan nanopartikel ZnO hingga 3% relatif terhadap massa metakaolin. Waktu setting terbaik yang diperoleh adalah pada penambahan ZnO sebesar 1% yakni sebesar 38 menit. Karakterisasi dengan Scanning Electron Microscope (SEM) memperlihatkan matriks geopolimer yang semakin homogen dengan bertambahnya massa ZnO.

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