Videos tagged py106
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PY106 pre-class video for session 11 - Series-parallel combination circuits
A worksheet to accompany this video is available at http://physics.bu.edu/~duffy/EssentialPhysics/combination.pdf
This video is a tutorial in one basic method of analyzing a series-parallel combination circuit (a circuit with one battery, connected [...]to a set of resistors which have both series and parallel combinations). We'll do one example of the method, which involves contracting the circuit down to a single equivalent resistor, and then expanding it back out to the original circuit. At each step of the expansion, we can determine the current through, and the potential difference across, each of the resistors.
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PY106 pre-class video for session 1 - Electric charge
Carrying on from PY105, we start PY106 by discussing some of the basic ideas about electric charge. We'll take a look at some simple experiments that we can do with charged objects, and explain them in terms of our basic model of charge. We'll also [...]talk generally about the ideas that charge is quantized, and that charge is conserved.
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PY106 pre-class video for session 43 - Radioactivity
This video is the last video of the year. In this video, we look at radioactivity. First, we look at some general trends in the chart of the nuclides. Then, we look at how a sample of radioactive material decays over time. Finally, we wrap things up [...]with a sample calculation.
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PY106 pre-class video for session 42 - The nucleus
In this video, we talk about some general features of the atomic nucleus, such as what it is made up of, how large it is, and what keeps it together. We will also look at the idea of the mass defect, which is related to the binding energy of the [...]nucleus. The video includes a calculation of the mass defect of a carbon-12 atom.
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PY106 pre-class video for session 39 - The Photoelectric effect
In this video, we go over the concepts underlying the photoelectric effect. It was for his explanation of the photoelectric effect that Albert Einstein was awarded the Nobel prize in Physics, in fact. What is it? When light illuminates a surface, it [...]is possible, at least sometimes, for the light to cause electrons to be emitted from that surface. This effect played an important role in the development of our understanding of light, being explained in terms not of light acting as a wave, but as light acting as packets of energy we call photons.
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PY106 pre-class video for session 38 - Special Relativity
This video serves as a quick introduction to special relativity. Instead of focusing on things that are different in different reference frames, the video focuses on the spacetime interval. The spacetime interval is a quantity that all observers, at [...]least in constant-velocity reference frames, agree on. We'll make use of the spacetime interval to do a sample problem, which has a bearing on relativistic effects such as time dilation, length contraction, and the twin paradox.
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PY106 pre-class video for session 36 - Diffraction
In this video, we discuss the idea of diffraction, which is the spreading out of a wave when it encounters an opening or an obstacle. We'll go over the equation for single-slit diffraction. We'll also talk some more about the history of our [...]understanding of light, in which diffraction played an important role.
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PY106 pre-class video for session 35 - Interference in two dimensions
In this video, we look at general characteristics of the interference pattern produced by two sources that are emitting identical waves. Such an interference pattern is produced by a laser illuminating two narrow slits (a double slit), and by two [...]speakers, emitting sound waves, connected to the same source. Understanding the pattern comes down to the path-length difference: if you stand at a particular location and measure the distance you are from each source, the path-length difference is the difference between those two distances. If the path-length difference is an integer number of wavelengths, constructive interference results. If the path-length difference is an integer number of wavelengths plus half a wavelength, destructive interference results.
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PY106 pre-class video for session 34 - The human eye and the camera
In this relatively brief video, we compare and contrast the human eye and the camera. Optically speaking, these two devices are actually very similar, with the biggest difference coming in the way the focusing is done.
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