# Recession Speed - maximum

1. May 16, 2012

### jsmith613

1. The problem statement, all variables and given/known data

see attachment
2. Relevant equations

3. The attempt at a solution

Now the question did not say what the wavelength was which is annoying.
BUT would this be a good way to work it out?

$\frac {v}{c} = \frac{Δλ}{λ}$

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2. May 16, 2012

### bjd40@hotmail.com

i think u r right somewhat. calculate the doppler shift of the wavelength as the entire range of visible region, i.e, 6600 angstorm minus 3900 angstorm. use the doppler shift of wavelength'' formula and get the actual speed of receeding. the actual wave length would be of UV (3900 angstorm). try this and tally the ans.