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I do not know if my answer can be classified as physics but Julia in her question wrote that the students are generally very interested in technology, engineering, physics and computer science and so I offer and answer that maybe can be considered technology or computer science. The pinhole or projective camera is a purely geometric model that ...

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I would use the Van der Waals equation. Here you are, in the German wiki: http://de.wikipedia.org/wiki/Van-der-Waals-Gleichung Also, there's lot of laws expressed as $a = b/c$. They may be too simple for your purposes, but they can be useful to show the application. For example, Ohm's law $I=V/R$, where $I$ is current intensity, $V$ voltage and $R$ is the ...

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While I agree with Alfred Centauri's answer, I am not sure it gives a direct answer to your specific question for the following reason. If there is a receiving antenna somewhere, there is always some reflection, however minute. If the antenna is connected to a circuit, the conditions of reflection will change, and the transmitter can "notice" that. In ...

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As an intermediate step, consider a sinusoidal source driving an infinite transmission line with some characteristic impedance $Z_0 = 50\Omega$. The source "sees" a real impedance of $50\Omega$ and so, power is delivered to the line and, since the TL is infinitely long, the power is transported down the line, via an electromagnetic wave, without reflection. ...

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Batteries produce a charge difference across the terminals as a result of a chemical reaction. A chemical gets changed into another one. Even in a rechargeable battery a chemical change takes place that is reversed. An electrolytic capacitor uses chemistry to create a thin layer with an electric field across it. The thinner layer than a "regular" capacitor ...

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