# ASTR 209 MT 1 (2)

80 cards

ASTR 209 MT 1 (2)

Created Feb 11, 2010
by
aftonw

 Shuffle Cards

# Flashcard Set Preview

 Side A Side B 1 a phenomenon with many bizarre and unique properties Light 2 some aspects of light can be best understood if it is thought as of being composed on infinitesimally... photons 3 speed of light (c) 300,000 km/s 4 the ultimate speed limit for everything in the universe speed of light (c) 5 do not have mass photons 6 have energy photons 7 particle-wave duality light 8 bending of light as it passes through a narrow gap diffraction 9 amount is proportional to wavelength/gap size diffraction 10 light doesn't travel in a medium 11 the distance between 2 successive troughs/crests of the wave wavelength (lambda) 12 height of the crest amplitude 13 the number of wave crests which pass a given point in 1 second frequency (v) 14 have an inverse relationship wavelength and frequency 15 long wavelength = small frequency 16 short wavelength = high frequency 17 in phase addition 18 antiphase cancellation 19 wave interference (2) 1. inphase2. antiphase 20 higher frequency = smaller wavelength = ______ energy greater 21 wavelength 4x10-4 mm (400nm blue light) to 7x10-4 mm (700nm red light) visible light 22 the range of light you can see when you pass a beam of white light through a prism visible light 23 sorts the light out by frequency via refraction prism 24 longest wavelengths radio 25 shortest wavelengths gamma rays 26 wavelengths between 0.0007 mm (700nm) and 0.1 mm (100 micro m) inrared 27 wavelength > 0.1mm (100 micro m) radio 28 wavelengths between 0.0004mm and 1x10-6 (1nm) UV 29 wavelength between 1x10-6 (1nm) to 1x10-10 (1x10-4 nm) x-ray 30 wavelengths < 1x10-11mm gamma rays 31 order of electromagnetic spectrum radio, infrared, visible, UV, x-ray, gamma 32 distribution of energy Planck Curve/Black Body Spectrum 33 absorbs all energy incident upon it and re-emits all the radiation (no reflection) Perfect Black Body 34 all motion has stopped (particle) absolute zero (0K) 35 get a precise measure of an objects temperature by measureing the wavelength of the peak of... wien's law 36 radiation emitted by neural atoms and molecules doesn't occur at any random requency/wavelength.... Spectral lines 37 the distance between the orbiting electron and the nucleus are proportional to the energy of the orbit (energy levels) 38 orbital = energy level 39 electron energy levels are quantized 40 photon will have so much energy that it knocks the electron off of the atom, leaving an ionized... ionization 41 ionized particles are called ions 42 gas in an ionized state is called plasma 43 if the photon's energy exactly matches the energy difference between 2 levels in the hydrogen... excitation 44 the electron jumps to a higher energy state excitation 45 electron spontaneously jumps back to some allowed lower energy level. Electron emits a photon... de-excitation 46 if the incoming photon doesn't ahve the right amount of energy to exactly match the difference... the atom and photon will ignore each other completely (nothing) 47 increase energy and ___________ frequency increase 48 a jump from level 3 to level 2, produces a red emission H-alpha (balmer alpha) 49 wavelength = 656.3 nm H-alpha (balmer alpha) 50 releases photons with only certain energies de-excitation 51 a series of bright narrow lines spectral lines 52 every atom or molecule will produce a series of these spectral lines 53 no 2 atoms or molecules will have the same set of these spectral lines 54 can determine the composition of interstellar gas and of stars from these spectral lines 55 hot bulb emits radiation at all wavelength continuous spectra 56 a hot bulb is a black body 57 a hot bulb produces a rainbow 58 light shines on hot, low density gas from a nearby star and produces an emission spectra 59 atoms get excited and then de-excite to form emission lines emission spectra 60 black strip with colourful lines emission spectra 61 light shines on cool, low density gas and produces an absorption spectra 62 atoms excite and de-excite to re-emit all the original photons absorption spectra 63 photons re=emitted in all directions, not just original directions, some light is removed from... absorption spectra 64 colourful strips with black lines absorption spectra 65 a luminous solid or liquid or a dense gas produces a continuous spectrum (black body emission) 66 a low density, hot gas produces an emission spectrum 67 a cool, low density gas will absorb emission from a hot background continuous spectrum, producing an absorption spectrum 68 kirchoff's laws (3) 1. a luminous solid or liquid or a dense gas produces a continuous spectrum (black body... 69 Electronic molecules emit Visible and UV 70 Vibrational molecules emit IR 71 Rotational molecules emit Radio 72 the sun rises due east today, but will rise slightly north of due east tomorrow spring equinox 73 longest day (most day light) of the year summer solstice 74 the noon time sun reaches its highest point of the year summer solstice 75 the sun has a declination of 0 degrees today but will have a negative declination tomorrow fall equinox 76 the sun crosses the meridian 23.5 degrees lower in altitude than the celestial equator winter solstice 77 sunset occurs at its farthest point south of due west for the year winter solstice 78 noontime sun casts the longest shadow winter solstice 79 the path traced otu by the sun in our sky over one year against the background stars ecliptic 80 a band of sky 16 degrees wide centered on the ecliptic zodiac

No comments yet! Be the first to add a comment below!