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# AQA Physics PHYA5 - 28th June 2016 [Exam Discussion Thread] watch

1. 1 mole of mass has volume 0.24. Mass of one molecule = 0.029/Avogradro's constant

p = m/v = (0.029/Na) / 0.24

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2. (Original post by TajwarC)
I got 1.2kgm-3 I think
yh same. For once I'm acctually getting the same answers as people here
3. unofficial ms for nuclear and astro?
4. Was the gas volume 4.4x10^-4?
5. (Original post by HughBax)
I can't remember the values they gave us but it was like, intensity of sunlight at earth is X times greater than light intensity from the Quasar and the Quasar is Y times brighter than the sun.

So I set up the equations using inverse square law

Sunlight intensity at Earth: 1 x 1/(1AU)^2
Quasar intensity at Earth Y x 1/d^2 = 1/X
Then rearrange to make d the subject

Its hard for me to properly explain it, but I'm basically making the Sun a standard with its light intensity at Surface of Earth and power =1
so intensity of Quasar at Earth is Intensity of Sunlight at Earth/X
brightness of Quasar is Y

When I say Brightness I mean light intensity at the Sun or At the Quasar or there power output or whatever. I don't need to know that anymore anyway.

A lot of that may not make the most sense and it may not help much but I'm pretty sure I did something like that.
For distance in quasars just set 1/(brightness multiple) = (power multiple)/4piR^2 . this gives R to be about 6.something x10^13.
Fairly confident this is correct
6. (Original post by DesignPredator)
Was the gas volume 4.4x10^-4?
That's what i got
7. were ther 5 questions in nuc;lear and 4 in turning points
8. (Original post by Yo12345)
1 mole of mass has volume 0.24. Mass of one molecule = 0.029/Avogradro's constant

p = m/v = (0.029/Na) / 0.24

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one molecule is not called density
9. (Original post by hahaox768)
one molecule is not called density
What did this even mean?

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10. (Original post by TajwarC)
I got 1.2kgm-3 I think
Jesus christ did i forget the unit or was it given
11. questions asked for mole then in questioon the value was in kgmol^-1 so no avogcados number in this years papers
12. (Original post by lucabrasi98)
Jesus christ did i forget the unit or was it given
given
13. (Original post by lucabrasi98)
Jesus christ did i forget the unit or was it given
The units question in Nuclear/Thermal was the unit for specific heat capacity.
14. Grade boundaries? For nuclear paper?

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15. (Original post by FireBLue97)
questions asked for mole then in questioon the value was in kgmol^-1 so no avogcados number in this years papers
lol
16. (Original post by duncant)
is it just our class in the whole of the UK that does medical physics?
We do medical physics. DID, that is unless we are in the same class

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17. Does anyone know what's the last question is? I hope I didn't miss out the last question
18. (Original post by Maliha01)
Can you give me the link to the medical physics chat? Thanks
Check the physics exam forum, its near the top
We do medical physics. DID, that is unless we are in the same class

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20. (Original post by kingaaran)
Constant temperature
Closed system
so this is definitely right? Because I got this as well so I hope so

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