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<title>BUniverse: Videos tagged caspy106 </title>
<link>https://www.bu.edu/buniverse/search/?q=&amp;sort=relevance&amp;view=thumbnail&amp;tag=caspy106</link>
<description><![CDATA[BUniverse: Videos tagged caspy106 ]]></description>
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<title>PY106 pre-class video for session 28 - Polarized light</title>
<link>https://www.bu.edu/buniverse/view/?v=ySRPFZF</link>
<guid>https://www.bu.edu/buniverse/view/?v=ySRPFZF</guid>
<pubDate>Thu, 24 Mar 2011 12:36:16 -0400</pubDate>
<description><![CDATA[In this video, we discuss polarized light (specifically, linearly polarized light, which is also known as plane polarized light). We go over, generally, ways in which light can be polarized, and then we talk about how to handle situations in which unpolarized light, or linearly polarized light, is incident on a polarizer. Specifically, we go over how to calculate the intensity of the light emerging from the polarizer, assuming you know the intensity of light incident on the polarizer. Finally, we wrap things up with a brief look at how reflection and scattering can produce polarized light, and what polarized sunglasses do.]]></description>
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<title>PY106 pre-class video for session 40 - The de Broglie wavelength</title>
<link>https://www.bu.edu/buniverse/view/?v=2Ewn86bW</link>
<guid>https://www.bu.edu/buniverse/view/?v=2Ewn86bW</guid>
<pubDate>Tue, 19 Apr 2011 17:54:01 -0400</pubDate>
<description><![CDATA[In this video, we spend some more time on wave-particle duality. We have already addressed the idea that light, in some situations, exhibits a wave nature; in other scenarios, it exhibits a particle nature. Here, we discuss a similar duality exhibited by things like electrons, which we usually think of as particles. In particular, we will talk about various situations in which "particles" exhibit a wave nature.]]></description>
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<title>PY106 pre-class video for session 37 - Thin-film interference</title>
<link>https://www.bu.edu/buniverse/view/?v=1FkoC5b2</link>
<guid>https://www.bu.edu/buniverse/view/?v=1FkoC5b2</guid>
<pubDate>Tue, 12 Apr 2011 13:41:31 -0400</pubDate>
<description><![CDATA[In this video, we cover the basics of thin-film interference. This is interference between light reflecting from the two surfaces of a thin film. A good example is a soap bubble - the beautiful colors in a soap film are explained by thin-film interference. We start by going over what happens when a wave is partly transmitted and partly reflected - in some cases, the reflected part of the wave reflects upright, and in other cases it reflects upside-down. We look at the basic idea of thin-film interference, and then we go through a five-step method we can apply when we analyze a thin-film situation.]]></description>
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<title>PY106 pre-class video for session 26 - Standing waves</title>
<link>https://www.bu.edu/buniverse/view/?v=1xWFJrYo</link>
<guid>https://www.bu.edu/buniverse/view/?v=1xWFJrYo</guid>
<pubDate>Wed, 16 Mar 2011 14:52:33 -0400</pubDate>
<description><![CDATA[In this video, we discuss the physics of standing waves, which is directly relevant to musical instruments. In particular, we focus on standing waves on strings that are fixed at both ends, which is how strings are set up on stringed instruments.]]></description>
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<title>PY106 pre-class video for session 22 - Electric generators</title>
<link>https://www.bu.edu/buniverse/view/?v=QzaPzYB</link>
<guid>https://www.bu.edu/buniverse/view/?v=QzaPzYB</guid>
<pubDate>Sat, 05 Mar 2011 11:40:42 -0500</pubDate>
<description><![CDATA[In this video, we take a quick look at electric generators - devices that generate electricity by exploiting Faraday's law. At its heart, a generator is a pretty simple device - it is a conducting loop in a magnetic field. By rotating the loop, the magnetic flux changes, and a current is induced in the loop. We'll explore the details of how this is done in the video.]]></description>
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<title>PY106 pre-class video for session 21 - Motional emf</title>
<link>https://www.bu.edu/buniverse/view/?v=1Pd9ytWw</link>
<guid>https://www.bu.edu/buniverse/view/?v=1Pd9ytWw</guid>
<pubDate>Sun, 27 Feb 2011 18:30:18 -0500</pubDate>
<description><![CDATA[Here's another relatively short video, introducing the concept of motional emf. That is voltage induced across the length of a conductor that is moving through a magnetic field. If you place such a conductor in a circuit, it will act like a battery, giving rise to an induced current.]]></description>
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<title>PY106 pre-class video for session 19 - Lenz&#039;s law, and a pictorial approach</title>
<link>https://www.bu.edu/buniverse/view/?v=Q6kV2Wh</link>
<guid>https://www.bu.edu/buniverse/view/?v=Q6kV2Wh</guid>
<pubDate>Thu, 24 Feb 2011 15:56:04 -0500</pubDate>
<description><![CDATA[In this video, we go over Lenz's law, which is a law that relates to the minus sign in Faraday's law. Faraday's law tells us that a changing magnetic flux will produce an induced voltage. Lenz's law tells us about the direction of the induced current in a loop or coil because of that induced voltage. There's a pictorial method for figuring out the direction of this induced current, so we'll spend a good part of this video on that.]]></description>
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<title>PY106 pre-class video for session 18 - Magnetic flux, and Faraday&#039;s law</title>
<link>https://www.bu.edu/buniverse/view/?v=1RIrT9WB</link>
<guid>https://www.bu.edu/buniverse/view/?v=1RIrT9WB</guid>
<pubDate>Thu, 17 Feb 2011 13:08:23 -0500</pubDate>
<description><![CDATA[In this video, we introduce the concept of magnetic flux, and then we go on to talk briefly about Faraday's law. Faraday's law is incredibly important from a practical sense, particularly for the generation of electricity. Almost all ways to generate electricity, with the exception of solar photovoltaic systems (solar panels) and batteries, exploit Faraday's law.]]></description>
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<title>PY106 pre-class video for session 13 - The force on a charge in a magnetic field</title>
<link>https://www.bu.edu/buniverse/view/?v=YEQ96VI</link>
<guid>https://www.bu.edu/buniverse/view/?v=YEQ96VI</guid>
<pubDate>Thu, 10 Feb 2011 12:00:41 -0500</pubDate>
<description><![CDATA[In this video, we look at the force that is experienced by a charged particle in a magnetic field. We compare this to the force experienced by a charged particle in an electric field, and we also go through a number of different scenarios to see what the magnetic force is determined by. In the end, we come up with an equation for the magnitude of the magnetic force, and we finish up with a discussion of the right-hand rule, which we use to determine the direction of the force.]]></description>
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<title>PY106 pre-class video for session 11 - Series-parallel combination circuits</title>
<link>https://www.bu.edu/buniverse/view/?v=11eVQeUh</link>
<guid>https://www.bu.edu/buniverse/view/?v=11eVQeUh</guid>
<pubDate>Tue, 01 Feb 2011 11:54:02 -0500</pubDate>
<description><![CDATA[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.]]></description>
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