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Threshold voltage, Energy, Planck's constant value f or the six LED (characterized by their wavelength λ and frequency ν) obtain by means of Method 2
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Recent studies have highlighted an alarming decline in young people's interest towards the study of scientific subjects, often considered interesting but not easily understood and appreciated by students. In particular, the introduction of Modern Physics (MP) key topics at secondary school level is a difficult and complex task because MP involves a...
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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 dem...
Citations
... All these learning cycles focus on the active construction of meaningful knowledge and the stimulation of high levels of critical thinking skills. Experimental evidence shows that traditionally instructed first-year undergraduates in Engineering continue to experience difficulties on dualism wave-particles and, in general, in Modern Physics topics [9][10][11][12][13][14][15][16][17]. The origin of these difficulties may be related to epistemology -their view of scientific knowledge -or to concepts - [18]. ...
... Student's scientist-like activities in each group were supported by two teachers having many years of expertise in the field of scientific research and on teaching physics at both high-school and university level courses. The preparation to the learning path was done through a traditional lecturing approach by using university general physics textbooks covering the introduction Giancoli -2008) and all the didactical aspects of the experiments (i) with the LED and (ii) the photoelectric effect [16][17][18]20]. The progression was found from the original research published on the illustration of quantum mechanics concepts [21] Other research-based methods to inquire on wave particle duality [22] have been considered as well. ...
... In order to calculate the Planck's constant, we followed the steps indicated in Ref.s [17,23]. The discussion about the Bohr's model and the Einstein explanation of the photoelectric effect led the students to the discovery of the mechanism of the working of a LED diode. ...
We here present and discuss a 5E-based learning activity focused on introductory concepts of Quantum Physics experienced at the Bachelor of Electrical Engineering of a Kenyan University. The described constructivist environment aimed at supporting an effective understanding of concepts very relevant in Modern Physics, such as wave-particle dualism, discretization, de Broglie wavelength, Heisenberg Uncertainty principle, atomic models, particle in a box, etc., by triggering a chain of reasoned investigation, inquiry, problem solving, and collaboration with peers. As it is well known, the 5E-based learning cycle is a student-centred instructional approach which helps learners to broaden their views on the concepts and link together the ideas, by means of five phases of instruction: Engagement, Exploration, Explanation, Elaboration, and Evaluation. Our findings show the proposed workflows successfully engaged students into active learning, stimulating the activation of the inquiry process and, at the same time, supporting the clarifying of important experimental and technological aspects of modern physics. This learning path represents a feasible example of a combination of a traditional lecture-based teaching method with laboratory and computational activities.
... Voltage of the LED according to the number of diodes & Threshold Voltage of LED[12] ...
Determination of Planck's constant using LEDs has been a favourite experiment even from student perspective because of its simplicity and taught in undergraduate laboratories for the past five decades. Several modifications and improvements adopted in both experiment procedure as well as data analysis part of this experiment during this period have been revisited in this paper. From the simplest experiment to determine turn-on voltages using human judgement with naked eye to advanced equipment to detect even pico ampere current flowing through LED's have been proposed by various researchers. Many of these proposals were successful in arriving at Planck's constant with excellent agreement with standard value. Reasons for yielding unrealistic values of Planck's constant have also been reported by several researchers.
