Board Thread:General Discussion/@comment-9490823-20141023235024/@comment-34326521-20141025003416

Bc9661 wrote: Blaziken rjcf wrote:

Doppler shifts apply to any wave, including sound. Google it. Or just go on Wikipedia, if you want the gist of it.

If you understood more about Doppler shifts, you'd know why you were wrong.

Obviously Doppler shifts in sound only occur in an atmosphere, but they do occur. Surely you've heard the sound a car's engine/ambulance's siren makes when it speeds past you. Blueshift and redshift the topic of this thread, is strictly referring to light, EM radiation. Sound's Doppler Affect has no part in cosmology whatsoever, and is never used. Maybe if you weren't still a student, you'd understand that. Or, maybe if you had payed attention to my post and your English teachers, you'd understand why I wasn't wrong to mention it, and why your statement was erroneous (you flat-out said that Doppler shifts only pertain to light, which is simply not true). I was making a comparison: whereas we can hear Doppler effects (by the way, it's "effect"; dunno why you keep saying "affect", which has a different meaning altogether), like sirens getting higher in pitch as they approach and lower as they move away, we can't see blueshifts or redshifts in light, simply because our eyes aren't sensitive enough. I said this in my post, but you decided to focus on the comparison itself, rather than the conclusion, and ended up embarrassing yourself by making erroneous statements.