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STKIP SINGKAWANGSTKIP SINGKAWANG

Journal VariabelVariabel Abstract

The photovoltaic experiment provided a simple, affordable method to determine Plancks constant through empirical learning. This experiment allowed students to present concrete low-cost materials. The data using easily available, low-cost materials. The experiment utilised a photovoltaic method, employing a simple, self-designed setup that used three laser pointers with wavelengths of 650nm (red), 535nm (green), and 405nm (blue) as independent variables. A 6V, 1W mini solar cell was used as the target, while the speed of light and electron charge were treated as control variables. The laser pointers were powered by a 3V battery. The data were analysed by plotting the relationship between 1/λ (inverse wavelength) and the measured voltage as linear regression analysis was performed to obtain the gradient, which was used to calculate Plancks constant. The experiment yielded a calculated Plancks constant of 7.09×10-35Js, with a deviation of 5.69 x 10-34Js, resulting in a relative error of 8.89%. This relative error could be attributed to several factors, including refraction effects caused by the glass layer and adhesive used to protect the semiconductor plate of the solar cell, as well as discrepancies between the actual wavelengths of the laser beams and the labelled wavelengths on the laser pointers.

Conclusion

In conclusion, a photoelectric effect experiment was successfully conducted using a simple apparatus consisting of three laser pointers—red, green, and blue—directed at a solar cell to produce an electric voltage.Through linear regression analysis of the resulting graph, the gradient value was used to determine Plancks constant, yielding a value of 7.This result showed a deviation of 5.69 × 10⁻³⁴Js, with a relative error of 8.

Future Research

Berdasarkan hasil penelitian ini, terdapat beberapa saran untuk penelitian lanjutan yang dapat dilakukan. Pertama, penelitian lebih lanjut dapat dilakukan dengan menggunakan laser pointer yang memiliki akurasi panjang gelombang yang lebih tinggi untuk mengurangi kesalahan pengukuran. Kedua, perlu dilakukan investigasi lebih mendalam mengenai pengaruh lapisan kaca dan perekat pada solar cell terhadap refraksi cahaya dan dampaknya terhadap perhitungan konstanta Planck. Ketiga, penelitian dapat diperluas dengan menguji berbagai jenis solar cell dengan karakteristik material yang berbeda untuk melihat apakah terdapat perbedaan signifikan dalam hasil pengukuran konstanta Planck. Penelitian-penelitian ini diharapkan dapat memberikan pemahaman yang lebih komprehensif mengenai efek fotovoltaik dan konstanta Planck, serta meningkatkan kualitas pembelajaran fisika modern melalui eksperimen yang lebih akurat dan terpercaya. Dengan demikian, mahasiswa dan peserta didik dapat memperoleh pengalaman empiris yang lebih baik dalam memahami konsep-konsep fisika kuantum.

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