x Turn on thread page Beta
 You are Here: Home >< Physics

# AQA Astrophysics Exam Discussion PHYA5 Physics Unit 5 Part B watch

2. (Original post by arrow_h)
Only 12 hours before the exam haha
3. Man I am soooo unprepared, compared to my other exams this is the one I'm most scared of, is anyone else the same?
4. A guy just said on the other thread 'If you're doing astrophysics, you'll need to remember I=P/4pi*d^2' is this true? It isnt on the spec?
5. (Original post by arrow_h)
Man I am soooo unprepared, compared to my other exams this is the one I'm most scared of, is anyone else the same?
left everything for the last 2 days. Im very unprepaired but I think if the calculations are okay and I get lucky with the 6 markers and they are on things I know then I could still get a good grade
6. (Original post by Ainsleyy)
A guy just said on the other thread 'If you're doing astrophysics, you'll need to remember I=P/4pi*d^2' is this true? It isnt on the spec?
It's basically just the inverse square law for intensity, in other words Intensity of the object is inversely proportional to the distance from the object. Never had to use that particular equation but you do need to be aware of the inverse square relationship between intensity and distance
8. 6 marker predictions anyone?

Posted from TSR Mobile
9. (Original post by JPencil)
6 marker predictions anyone?

Posted from TSR Mobile
Definitely star identification

Posted from TSR Mobile
10. 6 marker I got
Class K, orange, red giant
A, white, white dwarf
B, blue-White, main sequence

Not sure tho

Posted from TSR Mobile
11. What did you get for distance to object from lens? I think I got 0.20
Distance between objective and eyepiece I got 0.90
Wasn't sure what the silicon chip questions were asking so I basically just repeated what I said tbh

Posted from TSR Mobile
12. (Original post by cowie)
What did you get for distance to object from lens? I think I got 0.20
Distance between objective and eyepiece I got 0.90
Wasn't sure what the silicon chip questions were asking so I basically just repeated what I said tbh

Posted from TSR Mobile
I got the same values for lens and I know right?? 5 marks couldn't have been squeezed out of those questions
13. That was kinda nice. Very wordy though, not many calculations, in both part a and b
14. that was such a nice paper, what did everyone put for the star which was furthest away?
15. (Original post by TajwarC)
That was kinda nice. Very wordy though, not many calculations, in both part a and b
Due to this and the 6 marker requiring memorisation of classes and their temperatures etc I reckon the grade boundaries will be low (for this part at least)

Posted from TSR Mobile
16. (Original post by Mentalmirz)
that was such a nice paper, what did everyone put for the star which was furthest away?
The hottest one can't remember it's name, because it had the largest surface area and so largest radius and largest temperature so the power output of it would be greatest meaning very negative absolute magnitude, difference between absolute and apparent magnitudes is greatest (as it had the highest apparent magnitude)

Posted from TSR Mobile
17. (Original post by cowie)
The hottest one can't remember it's name, because it had the largest surface area and so largest radius and largest temperature so the power output of it would be greatest meaning very negative absolute magnitude, difference between absolute and apparent magnitudes is greatest (as it had the highest apparent magnitude)

Posted from TSR Mobile
yeah same
18. (Original post by cowie)
Due to this and the 6 marker requiring memorisation of classes and their temperatures etc I reckon the grade boundaries will be low (for this part at least)

Posted from TSR Mobile
Yeahh, the lack of calculations might cause problems but tbh the wordy questions weren't even that bad. It's just going to be difficult to get every point but I think most people would have at least written something.

Either way I'm pretty happy tbh

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: June 28, 2016
Today on TSR

### I have imposter syndrome at Cambridge

Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups

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