Turn on thread page Beta
    • Thread Starter
    Offline

    10
    ReputationRep:
    Im not too sure with how to go about this question: 1b;

    http://pmt.physicsandmathstutor.com/...y%204%20QP.pdf

    I know it says the galaxy is red shifted by 15% of their normal wavelengths - but what does it actually mean by this? I don't understand.

    Many thanks

    MS: http://pmt.physicsandmathstutor.com/...y%204%20MS.pdf
    Offline

    20
    ReputationRep:
    red shifted means longer wavelength - a line in the middle of the visible spectrum is shifted towards red end of the spectrum

    e.g. a source emitting 550nm (yellow/green) would be shifted to (1.15 x 550) = 632.5nm (orange)

    you want to feed it into the Doppler equation

    z=Δf/f0=-Δλ/λ0=v/c

    (don't think you do much with z at A level but you'll see it quite often in the literature where it's used as a shorthand... high z galaxy means high red shift galaxy example)
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: February 27, 2018

University open days

  1. University of Bradford
    University-wide Postgraduate
    Wed, 25 Jul '18
  2. University of Buckingham
    Psychology Taster Tutorial Undergraduate
    Wed, 25 Jul '18
  3. Bournemouth University
    Clearing Campus Visit Undergraduate
    Wed, 1 Aug '18
Poll
How are you feeling in the run-up to Results Day 2018?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.