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April6_09Lecture

April6_09Lecture - Doppler effect on electromagnetic...

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Doppler effect on electromagnetic radiation ( light ) v star Star approaching: Blue shift Star receding: Red shift Eyeballs: both at rest in S (frame of picture).
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Light from a nearby galaxy, at rest with respect to us. Wavelength (nm) Light from a distant galaxy Q1April 6. The plots below are spectra of starlight from a distant (top) and a nearby galaxy (bottom). The dark bars are spectral lines absorbed by elements in the stars. H Na Is the distant galaxy moving (A) towards or (B) away from us?
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Light from a nearby galaxy, at rest with respect to us. Wavelength (nm) Light from a distant galaxy, at ~ 0.05c. Q1April 6. The plots below are spectra of starlight from a distant (top) and a nearby galaxy (bottom). The dark bars are spectral lines absorbed by elements in the stars. H Na Is the distant galaxy moving (A) towards or (B) away from us ? The light is redshifted (longer wavelength), so the galaxy is moving away -- as is typical for distant galaxies. This is how scientists know that the universe is expanding!
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