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Lecture

Introduction to Astronomy-Lecture 1 Notes!.docx

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Department
Physics
Course
PCS 181
Professor
Margaret Buckby
Semester
Winter

Description
The Scientific Method: 1) Observation 2) Hypothesis 3) Experiment 4) Conclusion 5) Reproducibility The Electromagnetic Spectrum: Astronomical information is transmitted by Starlight. Starlight tells us the stars temperature, chemical composition, motion, pressure, magnetic fields, etc. Lamda (Greek Term) = Wave length *Radio wavelengths = Kilometers (Longest Wavelength) *Light is generally referred a particle. The EM Spectrum: Light: Mutually perpendicular oscillating electric and magnetic fields. Light: Moves in wavelike pattern at a speed of C = 3 x 10 m/s. Wavelength, (Lamda): distance between peaks of wave. Tachyons: Theoretical faster – than – light particles. Wavelength = Colour -9 -9 1 Nanometer = 1nm = 1m = 1 x 10 m = 10 m 1 x 109 Lamda Red = 700 nm = 700 x 10 m = 7 x 10 m -7 -9 -7 Lamda Violet = 400 nm = 400 x 10 m = 4 x 10 m Visible Colours: Red, Orange, Yellow, Green, Blue, Indigo, Violet. =ROY G BIV Photons: Bundles of energy – light as a particle. Red = 700 nm Orange = 600 nm Yellow = 550 nm Green = 500 nm Blue = 450 nm Violet = 400 nm  Takes white light into the prism to form the colour spectrum.  Vice versa for colour spectrum to form white light. Short - Wave Lengths: 1) Gamma Rays 2) X – Rays 3) Ultra – Violet = Dangerous to Eyeballs. Long – Wave Lengths: 1) Infrared = Detect with your skin. 2) In between Infrared and Radio Waves is Microwave. 3) Radio Waves Blue = 400 nm Yellow and Green = 550 nm Violet = 700 nm Frequency:  Frequency = f = number of wave peaks passing a given point each second.  Frequency is number of waves/second = complete cycles/second = cycles/ s = HZ.  F = C/ Lamda  F = 3 x 10 m/s = 4.3 x 10 14cycles/s = 4.3 x 10 HZ. red -9 700 x 10 m  F Violet = 3 x 10 m/s -9
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