- #1

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## Homework Statement

I'm working on this problem here:

http://hyperphysics.phy-astr.gsu.edu/hbase/astro/redshf2.html

The answer is already listed, it's the steps I'm worried about.

I don't see how they get from step 1 to step 2 here. They don't even tell me what T is. It seems that they are substitution T into the equation. I would think T = lambda/c+v but that's not what they're doing here.

I can't get from step 2 to 3, nor 3 to 4. They don't tell you what the equation for lambda source is, so I don't see how they work that into the equation.

Beta = v/c

Well if that's true then (1+v/c)^2 = 1 + 2v/c + (v/c)^2 not what they have.