Turn on thread page Beta
    • Thread Starter
    Offline

    10
    ReputationRep:
    Question 1cii please; http://pmt.physicsandmathstutor.com/...y%201%20QP.pdf

    Sirius-B is a white dwarf. In comparison with Sirius-B, Antares has 12 times greater mass and has 1.1 × 10^5 times greater radius. The surface temperatures of Sirius-B and Antares are 25000K and 4300K respectively.

    The intensity I of electromagnetic radiation emitted from the surface of a star is related to its temperature T in kelvin as follows:

    I ∝ T^4.

    Calculate the ratio:

    1. mean density of Antares/ Mean density of Sirius-B. I managed this kinda with p=mv - but still don't understand the markscheme -

    2. total power emitted from Antares / total power emitted from sirius-B

    1cii MS http://pmt.physicsandmathstutor.com/...y%201%20MS.pdf
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: February 28, 2018
The home of Results and Clearing

2,961

people online now

1,567,000

students helped last year

University open days

  1. SAE Institute
    Animation, Audio, Film, Games, Music, Business, Web Further education
    Thu, 16 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Fri, 17 Aug '18
  3. University of Bolton
    Undergraduate Open Day Undergraduate
    Fri, 17 Aug '18
Poll
Do you want your parents to be with you when you collect your A-level results?

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.