The Nature of Light A Prism “Breaks Up” White Light When white light passes through a prism a...
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Transcript of The Nature of Light A Prism “Breaks Up” White Light When white light passes through a prism a...
![Page 1: The Nature of Light A Prism “Breaks Up” White Light When white light passes through a prism a spectrum is formed.](https://reader036.fdocuments.in/reader036/viewer/2022062409/56649ef35503460f94c0682f/html5/thumbnails/1.jpg)
The Nature of LightThe Nature of Light
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A Prism “Breaks Up” White Light
When white light passes through a prism a spectrum is formed.
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Adding a Second Prism
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Three Types of Spectrums
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Three Types of Spectrums
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Kirchoff-Bunsen Experiment ~ 1855
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The Sun’s Spectrum
The sun has more than 30k dark lines
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Iron in the Sun
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The Rosette NebulaThe NGC 2363 Nebula
Horsehead Nebula
The reddish color seen in these pictures comes from an emission line from hydrogen
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Young’s Double-Slit Experiment ~ 1801
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Electromagnetic Radiation
Light consists of two perpendicular waves.
One wave is an electric field, the other is a magnetic field.
The wave travels at a speed c, which is orthogonal to both waves.
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Light Has Wave-Like Properties
= Wavelength, measure in meters
= Period, measured in sec/cycle
f = Frequency, measured in cycles/sec
= 1/ f c = f
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Since light is a wave it must have a wavelength, denoted by .
Colors and Wavelengths
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Absorption & Emission Lines
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Emission Lines for Various Elements
Do lines exist below 400 m and above 700 m?
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The Electromagnetic Spectrum
As the wavelength increases the frequency decreases.
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Gamma rays have the shortest
Radio waves have the longest
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Radiation and the Earth’s Atmosphere
High f waves do not make it to the surface, some IR and microwaves are absorbed by water. Low f radio waves are blocked by the Earth’s ionosphere. They all must be observed from space.
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Blackbody Radiation Curves
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Wien’s Shift
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Combine the Star’s Spectrum Combine the Star’s Spectrum with it’s Blackbody Curvewith it’s Blackbody Curve
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How Fast Does Light Travel?
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Why is the Sky Blue?
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Why is the Setting/Rising Sun Red?
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The Rutherford Experiment
-particles are shot at a thin film of gold foil. Most of the particles pass straight through foil. Some of the particles bounced back.
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Bohr Atom
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Hydrogen
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The Helium Atom
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The Origin of the Spectral Lines
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Creation of Red and Blue Light
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Ground State and
Excited State
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Lyman, Balmer and Paschen Series of Lines
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Balmer Lines in a Spectrum of a Star
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The Doppler Effect
QuickTime Movie
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The Doppler Effect
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Rotating and Revolving Planets
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Star Cluster NGC 3293 in Carina
T = ?
UV?
Visible?