- #1

MoAli

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## Homework Statement

I encountred a question that says : Assume that gravitational interactions between galaxies in groups lead to random galaxy velocities of 300 km/s At what distance would the redshift predicted by Hubble's law dominate over that produced by individual velocities? and what is the redshift at that distance?

I don't understand what's the difference between the 2 redshifts mentioned here, so I am confused on how to approach this

## Homework Equations

*V= h_0 * D*

where D is the distance and the Hubble constant is 2.18*10^-18 s^-1

where D is the distance and the Hubble constant is 2.18*10^-18 s^-1

V /c = Δλ/λ

## The Attempt at a Solution

I tried substituting in the numbers and got D= 1.36*10^20 km and v/c=0.001. [/B]