Curiosity is a basic important aspect encourages students in finding various information which, in turn, aid them to encompass the concept learnt. This descriptive research aimed at elaborating the curiosity profile of junior high school students in science learning, particularly in excretion system topic who were taught using the authentic inquiry learning. This research was conducted at SMP Negeri 14 Yogyakarta with 32 of eight graders as the subjects. The instrument used was curiosity response questionnaire. The data obtained was analyzed using percentage. The results showed that the average of curiosity achievement obtained was categorized as strong (75%). However, the comparison of implementations between the authentic inquiry learning and the other learning models are needed to get more comprehensive information.

Biomechanics is part of a scientific discipline that applies basic mechanical principles to explain the performance system in the human body (living things). One application in the human body is when doing push ups. Push up props are made to find out the relationship between arm length, mass, and angle to the force and torque. After the tool is assembled, the tool is experimented with mass manipulation variables 125 g; 290 g; 515 g and body length 20; 40; 60 cm. Based on the experimental results that the greater the arm's length, the greater the force and torque. The greater the mass of the object, the greater the force.

This study examines the visualization of the creation and operation of lissajous waves on the oscilloscope screen using a spreadsheet on Microsoft Excel 2013. The purpose of this research is to produce a visualization and how to operate lissajous waves using Microsoft Excel. The subject of this research is a spreadsheet program on Microsoft Excel software. Research location in the Yogyakarta State University Postgraduate Program building. The results of the study are expected to produce a visualization of how and how to operate a lissajous wave using Microsoft Excel. The data used uses fixed amplitude, frequency ratio 1:1 (a=1, b=1) with different phases at special angles ie 0o, 30o, 60o dan 90o. As well as other data with different frequency comparisons but using fixed amlitudes and phase differences of 90o. Comparison of frequency, amplitude and phase difference has the main role in forming lissajous wave patterns. It can be concluded that the speadsheets program on Microsoft Excel 2013 can be used to create simulations and describe lissajous wave patterns on oscilloscope screens in physics learning. Through simulation of lissajous wave patterns using spreadsheets on Microsoft Excel can make it easier for students and teachers to understand the lissajous curve on the oscilloscope screen. AbstrakPenelitian ini mengkaji tentang visualisasi pembuatan dan pengoperasian gelombang lissajous pada layar osiloskop menggunakan spreadsheet pada microsoft excel 2013. Tujuan penelitian menghasilkan visualisasi dan cara pegoperasian gelombang lissajous menggunakan microsoft excel. Subjek penelitian ini adalah program spreadsheet pada software microsoft exel. Lokasi penelitian di gedung Program Pascasarjana Universitas Negeri Yogyakarta. Hasil penelitian diharapkan dapat menghasilkan visualisasi pembuatan dan cara pegoperasian gelombang lissajous menggunakan microsoft excel. Data yang digunakan menggunakan amplitudo tetap, perbandingan frekuensi 1:1 (a=1, b=1) dengan beda fase pada sudut istimewa yaitu 0o, 30o, 60o dan 90o. Serta data lain dengan perbandingan frekuensi yang berbeda namun menggunakan amlitudo tetap dan beda fase sebesar 90o. Perbandingan frekuensi, amplitudo dan beda fase memiliki peran utama dalam pembentukkan pola gelombang lissajous. Dapat disimpulkan bahwa program speadsheets pada miscrosoft excel 2013 dapat digunakan untuk membuat simulasi dan menggambarkan pola gelombang lissajous pada layar osiloskop dalam pembelajaran fisika. Melalui simulasi pola gelombang lissajous menggunakan spreadsheets pada microsoft excel dapat memudahkan siswa maupun guru dalam memahami kurva lissajous pada layar osiloskop. This is an open access article under CC-BY-SA license (https://creativecommons.org/licenses/by-sa/4.0/) This is an open access article under CC-BY-SA license (https://creativecommons.org/licenses/by-sa/4.0/) Gambar 9. Perbandingan frekuensi 1:1 (a=1,b=1 dan δ=30 o )Kurva lissajous disajikan pada gambar 10 dengan beda fase 60 o , perbandingan frekuensi 1:1. Gambar 10. Perbandingan frekuensi 1:1 (a=1,b=1 dan δ...

This research is experimental research. The research aims to analyze the absorbance and wavelength values on the certain color spectrum based on the age of noni leaf sample. Variation in absorption and wavelength occurs in the red spectrum ranges between 650 to 700 nm. Maximum absorption occurs in the middle of noni leaf followed by the tip of noni leaf sample but the yellow leaf sample results poor absorption. Chlorophyll a has main leaf pigment the most which occurs in the light reaction of photosynthesis. The maximum absorption which ranges between 3,5 to 4,0 A occurs in the blue spectrum ranges between 400 to 450 nm. Chlorophyll b absorbs photon energy in sun light. A wavelength ranges between 500 to 600 nm occurs in the green spectrum which has low absorption of three samples ranges 0,5 to 1,5 A. The chlorophyll reflects light of the green spectrum; therefore, it causes low absorption.