# PCS 181 Lecture Notes - Electromagnetic Spectrum, Wavelength, Falsifiability

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21 Mar 2013
School
Department
Course
The sceintifiic method
-observation
-hypothesis
-experiment
- conclusion
-reproducibility
..........and is falsifiable.................
Unit 1: the electromagnetic spectrum
Astronomical information is transmitted by starrlight.
Starlight
Starlight->tells us-> the star’s temperature, chemical composition, motio, pressure, magenetic fields etc.
Wavelength: distance between 2 peaks
The EM Spectrum
Light: mutually perpendicular oscillating electric and magnetic fields.
Light: moves in a wavelike pattern at a speed of c=3x108 m/s (default meaning of lower case ‘c’ is speed
of light)
Tachyon: particles that moves faster than light (hasn’t been discovered)
Cern: neutrenoes research topic
Wavelength ‘lambda symbol’: distance between 2 peaks
Tachyons: theoretical faster-than-light particles
Eleltromagnetic properties
Wavlength-> is color
1 nanometer=1nm=
 m = 1x10-9m = 10-9m
Lamda red= 700nm = 700x 10-9 m= 7x 10-7m ( YOU HAVE TO KNOW THIS)
Lamda violet= 400nm = 400x 10-9 m= 4x 10-7m (YOU HAVE TO KNOW THIS)
Visible: ROY G BIV
Photons: bundles of energy-> lgiths as a particle
White light-broken into dofferetn colour- different colour put together =white light
Direct of wave motion
Wave length
Peak or
crest
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## Document Summary

Starlight->tells us-> the star"s temperature, chemical composition, motio, pressure, magenetic fields etc. Light: mutually perpendicular oscillating electric and magnetic fields. Light: moves in a wavelike pattern at a speed of c=3x108 m/s (default meaning of lower case c" is speed of light) Tachyon: particles that moves faster than light (hasn"t been discovered) Lamda red= 700nm = 700x 10-9 m= 7x 10-7m ( you have to know this) Lamda violet= 400nm = 400x 10-9 m= 4x 10-7m (you have to know this) Photons: bundles of energy-> lgiths as a particle. White light-broken into dofferetn colour- different colour put together =white light. = number of wave peaks passing a given point each second. Every calculator gives different answer so on the test look for the closest answer. Note that the surface temperature of the sun is ~5800 k. E=hf h is planck constantresearch topic constant book the 6 constants. Ered = (6. 625x10-34 jxs)(4. 3 x 1014 cycles/s)"s" is in denominator.

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