In the master's thesis, we present the development of an experiment suitable for the experimental task at the 6th European Physics Olympiad, which was organized in Slovenia in May 2022. We identify the key factors in designing the experimental task and discuss potential challenges that may arise during the development. Our focus is on creating appropriate task instructions that ensure the right level of difficulty and independence in problem-solving. We ensure that the task is appropriately timed, considering the limited time that the participants have to solve the task during the Olympiad. Next the cost-effective parts are used to manufacture a large number (a few hundred) of experimental set-ups that are used during the experimental competition. We also try to organize the competition area in such a way, as to provide participants with the optimal conditions for successful task completion. The experiment, based on the domain of black body radiation and Stefan-Boltzmann's law, is initially performed by us, and we prepare the intended solutions for the final version of the task. Additionally, we present the participants' success in solving the task at the Olympiad. Lastly, the results of the experimental task are analysed.
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