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Light, passing through heavy glass, has its direction of polarization rotated slightly if a magnetic field is applied to the glass.
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Three dimensional model showing B-field and E-field of electromagnetic radiation.
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Production and detection of electromagnetic waves using LC oscillator; transmission and detection inductors are 1m diameter copper rings.
Radio Wave Properties
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A 300 MHz signal broadcast from a half-wave dipole antenna and various receiver antennae show the orientation of E and B components of electromagnetic radiation.
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3 GHz (10 cm wavelength) microwaves are used for the demonstration of travelling and standing waves, reflection, interference, refraction, diffraction, absorption, polarization, tunneling, and waveguides.
Pulse Reflections in a Coaxial Cable
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Individual voltage pulses sent down a coaxial cable reflect differently depending on how we terminate the end of the cable.
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The group velocity of two harmonic waves can be shown (on an oscilloscope) to be less than or greater than the individual phase velocities.
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The radiation pattern from a 1/2 wave dipole antenna can be explored with a transistor radio (100 MHz, FM).
FM Standing Waves
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Electromagnetic waves reflecting off the blackboard interfere with incoming waves to produce standing waves.
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The visible part of the electromagnetic spectrum is represented by less than an octave of the keys; UV, IR, and microwaves are also indicated.
Mailing Address: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138
Campus Location: Science Center B-08A | Tel: (617) 495-5824 | Email: scidemos-at-fas.harvard.edu