Hey there Sign in to join this conversationNew here? Join for free

Astro physics Spectral class question!!! HELP!!!

Announcements Posted on
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    Click image for larger version. 

Name:	IMG_3752.jpg 
Views:	41 
Size:	517.9 KB 
ID:	154792

    I'm really confused by the question. Surely the smaller star ought to be hotter, but the mark scheme says it belongs to class G, WTF??? :mad::mad:

    Please help!
    • 19 followers
    Offline

    ReputationRep:
    It's been a while since you posted and nobody's replied yet...maybe you should check out MarkedbyTeachers.com, TSR's sister site. It has the largest library of essays in the UK.

    They've got over 181,000+ coursework, essays, homeworks etc.. all written by GCSE, A Level, University and IB students across all topics. You get access either by publishing some of your own work, or paying £4.99 for a month's access. Both ways give you unlimited access to all of the essays.

    All their documents are submitted to Turnitin anti-plagiarism software, so it can't be misused, and the site's used by hundreds of thousands of UK teachers and students.

    What's more, you can take a look around the site and preview the work absolutely free. Click here to find out more...
    • 5 followers
    Offline

    ReputationRep:
    The cooler star should be the larger... Your explanation is poor though and in a 5 mark question you might only get 1 mark for giving the right answer with a bad explanation.
    Imo you should have been talking about apparent magnitude (not power) luminosity, temperature, diameter and cross sectional area of the stars and distance to observer (same for both in a distant binary obviously)

    the question is a chance for you to show off what you understand about what affects the amount of light coming out of a star.

    since
    it's a real example you can look it up to confirm the accepted sizes of the stars in herc 95
    • 1 follower
    Offline

    ReputationRep:
    It's 5 marks for the whole thing, I think you're just forgetting that it works the other way round, with lower magnitudes meaning the star is brighter (i didn't read the question properly though).

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?

    this is what you'll be called on TSR

  2. this can't be left blank
    this email is already registered. Forgotten your password?

    never shared and never spammed

  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide the button to the right to create your account

    Slide to join now Processing…

Updated: June 14, 2012
New on TSR

Talk about SQA results day

Join the chat ahead of grades coming out on Tuesday

Article updates
Reputation gems:
You get these gems as you gain rep from other members for making good contributions and giving helpful advice.