Phys 231, Topic 2: The Physics of Astrophysics

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Physics 231: Section 2The Physics of Astrophysics

http://mimas.physics.drexel.edu/phys231

Phys 231, Topic 2: The Physics of Astrophysics

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Two-Body Interaction

Phys 231, Topic 2: The Physics of Astrophysics

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Orbits follow conic sectionsUnbound

Bound

Phys 231, Topic 2: The Physics of Astrophysics

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Kepler’s 1st and 2nd Laws

Each purple region has the same area and is swept out in equal time

Phys 231, Topic 2: The Physics of Astrophysics

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Gravity from an extended (spherical) distribution

A “sees” mass 1+mass 2B “sees” only mass 1

Phys 231, Topic 2: The Physics of Astrophysics

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Rotation curve of the Milky Way

Phys 231, Topic 2: The Physics of Astrophysics

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v

Phys 231, Topic 2: The Physics of Astrophysics

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Waves interfere with one another

Phys 231, Topic 2: The Physics of Astrophysics

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The Wave Nature of Light

Phys 231, Topic 2: The Physics of Astrophysics

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Electromagnetic Waves

Phys 231, Topic 2: The Physics of Astrophysics

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Newton’s Double Prism experiment

Phys 231, Topic 2: The Physics of Astrophysics

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The Electromagnetic Spectrum

Phys 231, Topic 2: The Physics of Astrophysics

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The Solar Spectrum

Phys 231, Topic 2: The Physics of Astrophysics

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SDSS Response Function

Phys 231, Topic 2: The Physics of Astrophysics

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Spectral lines of some common elements

Phys 231, Topic 2: The Physics of Astrophysics

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Phys 231, Topic 2: The Physics of Astrophysics

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Kirchoff’s Spectroscopy Laws

Phys 231, Topic 2: The Physics of Astrophysics

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Doppler Shift

Phys 231, Topic 2: The Physics of Astrophysics

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Maxwell-Boltzmann Distribution

Phys 231, Topic 2: The Physics of Astrophysics

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The RHS of the SAHA equation

Solar Densities

Earth AtmosphericDensities

Phys 231, Topic 2: The Physics of Astrophysics

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Ionization fraction of hydrogen

Solar

Earth