Lecture06 - 1 Lecture#6 Radiation and Spectra I • Making...

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Unformatted text preview: 1 Lecture #6: Radiation and Spectra I • Making Measurements of the Solar System: – The Nature of Light. – Properties of Electromagnetic Radiation. Astro 102/104 1 – Spectroscopy. The Main Point Measuring the light from objects in Astro 102/104 3 the Solar System (and beyond) provides most of our information on their fundamental properties. The Nature of Light • Light provides information on distant objects that are too far away to routinely visit (or visit at all!) • Light is a form of electromagnetic radiation: – Radiating "disturbances" in electric & magnetic fields. Astro 102/104 4 – Disturbances generated by motions of charged particles. – Electricity, magnetism, and light are all related. • Much of what we know of planets, moons, asteroids, comets, and the Sun comes from decoding their light! Light as a Wave James Clerk Maxwell (1831-1879) Astro 102/104 5 •Discovered the relationship between electricity and magnetism. •Developed theory of the wave nature of light: – One of the most famous and fundamental set of equations in physics! – Oscillating fields are generated by subatomic motions. – The fields propagate into space like waves on a pond. – These waves propagate at the speed of light: c = 3x10 8 m/sec. – Physicists have shown that c is the Universal Speed Limit! 2 Wave Properties of Light • Light travels just fine through a vacuum. • A fundamental parameter of light is its wavelength ( λ )....
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Lecture06 - 1 Lecture#6 Radiation and Spectra I • Making...

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