Assignment Details

2 - Fusion ExamPro check

Year 2022-23

10E-Physics

Date Due

Nov. 22, 2022

Additional Info
On OneNote in lesson;
03 - Astrophysics > 02 - Fusion and Stars

Try sheet;
"2 - Fusion ExamPro check"

If you weren't in, I saved my annontated slides as an attachment to the same lesson folder in the Content Library so you can complete your handouts

The "1 - Lifecycle of stars explained" sheet will help you with the homework (Solutions on the saved annotated slides in content library)

SOME POINTS TO READ BEFORE STARTING;
THE KEY IS NOT TO OVERTHINK THE ANSWERS......

  • Q1
    • a) i) and ii) Use the wording in the question, and the sentence scaffold - it's 1 mark! Keep it simple; e.g. "The larger the 'mass of dust and gas in the cloud', the ................ the 'force of gravity' between then"
    • b) it's who marks, keep it simple!...
      • State what the two forces are
      • State whether they are a force inwards, or outwards on the star
      • Compare their relative sizes if its stable
      • If you really want to impress me, get all the detail in with less words, and use bullet points
    • c) Stage 4 is asking about the Red SuperGiant phase where helium starts to fuse to form heavier elements (up to iron) and swells. Again, keep it simple - it is only 2 marks! Cover the key parts and stop!
  • Q2)
    • a) Keep it simple - 2 points!!
      • What fuses together to make Helium
      • What two conditions does it need?
    • b) Keep it simple - 2 points!!
      • USe your notes on the "1 - Lifecycle of stars explained" to help - again - 2 bullet point!!...
      • In which stage of the lifecycle are 'heavy' elements made?
      • Why in this stage?  What is it about the conditions (what is there now enough of) when this happens that helps fusion of heavy elements?
    • c)  2 points max!
      • What is the event called that scatters the elements?
      • What two words did I use that describe what happens to the Red SuperGiant?
  • Q3
    • a)  Do a simple calculation to show that 4x Relative mass of H does not equal (and is more) that 1x He.  Then ONE SHORT sentences that states WHAT happens to mass of sun (NOT WHY - it does not ask you to explain!)
    • b)  2 points!...
      • Does the sun have a lot (or a little bit) of hydrogen?
      • Does one fusion event release a lot (or a little bit) of energy?
      • Does it all fuse at once, or 'slowly over a long period of time'


Attachments