system
Given the following post, respond as if you're commenting on Reddit:
human
How is the Doppler effect different for sound vs light waves?

I made a bet with a friend of mine on this (I said they were somehow a little different), but everything I'm reading online seems to support his side. I did manage to dig up a sentence from Lawrence Krauss' "A Universe from Nothing" where he says that "It turns out that the same phenomenon occurs for light waves as sound waves, although for somewhat different reasons." Can anybody shed some light on these "somewhat different reasons?"
gpt
They are mostly the same with a few subtle differences.

With sound, it matters how fast the emitter and observer are both moving with respect to the medium. With light, it only matters how fast they are moving relative to each other. With light, things can be moving fast enough that the relativistic Doppler effect has to be taken into account, but nothing has a fast enough speed of sound for this to matter for sound.