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Physics 1051: Lecture 4: Slide 1 Light Introduction
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Physics 1051: Lecture 4: Slide 2 Light -- an Electromagnetic Wave
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Physics 1051: Lecture 4: Slide 3 Electromagnetic Wave Transverse Traveling oscillating electric field and magnetic field Can travel through space Generated by accelerated charges Emitted by excited atoms when they return to ground state
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Physics 1051: Lecture 4: Slide 4 Electromagnetic Spectrum
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Physics 1051: Lecture 4: Slide 5
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Physics 1051: Lecture 4: Slide 6 Visible Part of Spectrum 7 4
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Physics 1051: Lecture 4: Slide 7 Spring Model Electrons can be modeled as particles connected to the atomic nucleus by springs Electrons of atoms in glass have certain natural frequencies of vibration
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Physics 1051: Lecture 4: Slide 8 Light Transmission
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Physics 1051: Lecture 4: Slide 9 Glass Transparency Ultraviolet matches natural frequency of electrons in glass Infrared vibrates entire atom or molecule Both result in warming of the glass
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Physics 1051: Lecture 4: Slide 10 Opaque What does it mean for an object to be opaque? Light is absorbed without being re- emitted.
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Physics 1051: Lecture 4: Slide 11 Umbra to Penumbra
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Physics 1051: Lecture 4: Slide 12 Solar Eclipse
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Physics 1051: Lecture 4: Slide 13
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Physics 1051: Lecture 4: Slide 14
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Physics 1051: Lecture 4: Slide 15 Moon’s Orbit is Tilted
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Physics 1051: Lecture 4: Slide 16 The Eye
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