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Doppler Effect and Red Shift
The Doppler Effect
Doppler effect: the change in wavelength and frequency
Happens with all waves, including EM radiation
Siren: moves towards you- higher pitched then when moving away
The frequency and wavelength change because waves bunch together in front of the source
and stretch out…

Page 2

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z = ff

If star is red shifted, f>(change)f, so (difference)f and z will be positive
z =- ww



W= wavelength

Cosmological red shift
All distant galaxies show red shift, moving away
Astronomers say space is expanding and light waves are being stretched = COSMOLOGICAL
RED SHIFT
Formulas still work…

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