- #1
prochatz
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I've recently read that when a galaxy or star(if I'm right) comes closer to earth, its spectrum shifts to blue. Correspondingly, when it travels away from Earth its spectrum shifts to red. The cause of the shift is Doppler effect.
My question: Why don't we observe doppler effect when an ambulance drives away? If the light on top of the ambulance was blue, shouldn't we expect any redshift? Using the same thoughts, why don't we observe blueshift on the front lights of a truck which comes close to us?
Thanks
My question: Why don't we observe doppler effect when an ambulance drives away? If the light on top of the ambulance was blue, shouldn't we expect any redshift? Using the same thoughts, why don't we observe blueshift on the front lights of a truck which comes close to us?
Thanks