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Explore the essential concepts of light and electromagnetic waves, including their transverse nature and ability to travel through space. Discover how light is generated by accelerated charges and excited atoms, and delve into the electromagnetic spectrum and the visible part of it. Learn about the Spring Model and how electrons in glass can be modeled as vibrating particles connected by springs. Understand light transmission, glass transparency, and the interactions of light with ultraviolet and infrared frequencies. Unravel the concept of opacity and its implications on light absorption and re-emission, and delve into the phenomenon of solar eclipses from umbra to penumbra.
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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
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
Glass Transparency Ultraviolet matches natural frequency of electrons in glass Infrared vibrates entire atom or molecule Both result in warming of the glass
Opaque • What does it mean for an object to be opaque? • Light is absorbed without being re-emitted.
