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Light Introduction

Light Introduction. Light -- an Electromagnetic Wave. 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. Electromagnetic Spectrum.

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Light Introduction

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Presentation Transcript

  1. Light Introduction

  2. Light -- an Electromagnetic Wave

  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

  4. Electromagnetic Spectrum

  5. Visible Part of Spectrum 4 7

  6. 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

  7. Light Transmission

  8. Glass Transparency Ultraviolet matches natural frequency of electrons in glass Infrared vibrates entire atom or molecule Both result in warming of the glass

  9. Opaque • What does it mean for an object to be opaque? • Light is absorbed without being re-emitted.

  10. Umbra to Penumbra

  11. Solar Eclipse

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