1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Doppler shift

  1. May 15, 2012 #1
    1. The problem statement, all variables and given/known data
    Supernovae type Ia has a red shift z=1.1. Observed luminosity of the star has changed in the interval of 60 days. What time interval would an observer measure in the near vicinity of the star? What is the speed that the star is moving away from us? What is the distance of the star from us ([itex]h\approx 0.7[/itex])

    2. Relevant equations

    Red shift:



    o is for observed, and e is for emitted light.

    Hubble law:

    [itex]v=H_0 d\approx 100 h d[/itex]

    3. The attempt at a solution

    Using the provided formulas I got:

    [itex]d=2692.34 Mpc[/itex]
    [itex]T_e=28.5715 days[/itex]

    Is this correct?
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted