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wavefront spread out symmetrically
what happens when an object emits waves normally
Wavelength of waves in front of the waves decrease
Frequency increases
How moving objects causes wavelengths to change in front
Wavelength of waves in front of the waves increase
Frequency decreases
How moving objects causes wavelengths to change behind
The change in frequency or wavelength due to the relative motion between a source and an observer
Doppler effect
If an object moves towards an observer, the wavelength of light decreases
Blueshift
The observed increase in the wavelength of light due to the source moving away from the observer
redshift
Light coming from distant galaxies is redshifted so they are moving away from us
Red shift proving the universe is expanding