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# Doppler effect and spectroscopy

Comenius Dive in the Sky
Austria

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### Doppler effect and spectroscopy

1. 1. The Doppler Effect detected by Christian Doppler
2. 2. How does it work ? • The lenght of the waves gets longer on the side where the object go away and shorter on the other side.
3. 3. How this effect affects our universe • When a shining objekt in the universe moves it behaves like sound
4. 4. • If the speed of the object increase the wavelength increase too. v v v
5. 5. We only need the wavelength to calculculate the speed, because:
6. 6. But the speed is very high to the speed of light, so we need the formula of the Theory of the Relativity
7. 7. How we can calculate the distance of the object when we know the speed ?
8. 8. Hubble law • The linear correlation between distance (r) and flightspeed (v) is called hubble law v=h0r
9. 9. Hubble konstant • „Hubble - konstant" H0 = 72 km/ s·Mpc 1 parsec = 3,6 Lightyears 1Mpc = 3,6 Millionen Lightyears
10. 10. • In 1 Mpc 72km/s • In 2 Mpc 144km/s • . • . • . • In ? y Mpc x km/s x : 72 = y Mpc
11. 11. • 1 Mpc = 3,6 Million Light-years • y Mpc = 3,6 . y Million Light-years • Can we imagine this distance? • In 1s = 300 000 km • 1Mpc = 3,6 Million Lightyears
12. 12. Spectroscopy The secret behind the light
13. 13. History: • 1814 sun spectrum from Joseph von Fraunhofer with unknown black lines in the spectrum • 1859 Kirchhoff and Bunsen noticed that different chemical elements color the flame from a bunsen burner in different colours.
14. 14. Two types of visual spectroscopy • Photon emission • Photon absorption/Fraunhofer lines.
15. 15. Ca+ Hβ Mg Na+He Hα O2
16. 16. Quasar calculations

Comenius Dive in the Sky Austria

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