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Lecture 20
Magnetism is COOL! The history of magnetism begins much earlier with the ancient civilizations in Asia Minor. It was in a region of Asia Minor known as Magnesia that rocks were found that would attract each other. It is clear, although not obvious, that magnetism and electricity are closely related. If you ask me, magnets are pretty freaky things, so let's explore their properties.
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Lecture 21
Electromagnetic Induction and Faraday's Law; AC Circuits. Where else can you find SI units called "Henrys" and "Farads?" Intricately intertwined physical properties of exciting electricity and mysterious magnetism are explored Huh? Well, it is found: (1) an electric current produces a magnetic field; and (2) a magnetic field exerts a force on an electric current of moving electric charge.
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Lecture 22
Electromagnetic Waves.....and then there was LIGHT! The culmination of electromagnetic theory in the nineteenth century was the prediction, and experimental verification, that waves of electromagnetic fields could travel through space. And you know what? Light is those waves.
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Lecture 11
Vibrations and Wave motion are intimately related subjects. Waves-- whether ocean waves, waves on a string, earthquake (s & p) waves, or sound waves in air-- have as their source a vibration. There is a whole lot of shaking going on! Hehehehe.
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Lecture 12
Sound. We can distinguish three aspects of any sound. First, there must be a source for the sound; and as with any wave, the source of a sound wave is a vibrating object. Second, the energy is transferred from the source in the form of longitudinal sound waves. And third, the sound is detected by an ear or instrument. Hey! Turn down that stereo would ya!? I'm trying to study my *favorite* subject of physics!
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Lecture 23
Geometric Optics. Mirror. Mirror on the wall, why is my image an "inverted" and "virtual" one? Ok, everyone! Please, come out of your "concave" so we can explore the "convex" nature of light. Let's see if we can't "magnify" the subject a little bit. Don't forget to "reflect" on the ideas too! I am just too funny for words!
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Lecture 24
The wave nature of light. Diffraction, refraction, reflection, interference, spectra, and polarization. Light is a wave! No! It is a particle! No! It must be a wave! I say particle! What the heck is light... a wavicle? Light does some darned wacko things, so why not explore what happens and what it all means.
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