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# AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread] watch

1. (Original post by Reverse Swing)
I though it was released on midnight results day...they can be found on their websites but they won't always update it on time I think.
Yeah, i think that should be

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2. (Original post by Mehrdad jafari)
Yeah, i think that should be

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AQA, OCR and Edexcel do theirs the day before. WJEC is different each year - sometimes not updating until actual results day.

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3. For those guys who did the applied one, do you think the paper this year was harder than the previous years or easier? I messed it up so I wanna know what kind of grade I can get. Thank you very much.
4. Yeah right I think I wrote sth stupid in physics exam, a 6 marks question asking how to determine absolute zero. I never revise it as it only occupies such a tiny space in the book and I never pay attention to it.

I put down use a kelvin thermometer and a Celsius thermometer to measure the temperature of a fixed amount of gas respectively.... then work out the difference....the subtract the difference from 0......

Bull****. If a kelvin thermometer is based on the concept of absolute zero...then what is the point to use it to determine absolute zero... I rethink after the exam and feel the answer is stupid...

I did also put down absolute zero is when the mean kinetic energy of all gas molecules becomes zero so does their root mean square speed is zero so it's actually impossible. And the experiment should be carried at constant pressure with a fixed mad and volume of gas. Take repeats and average. Honestly how many marks will I lose for this question I feel so regretful and scared
What did you write for that question?

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5. (Original post by xuyixuanpbs)
Yeah right I think I wrote sth stupid in physics exam, a 6 marks question asking how to determine absolute zero. I never revise it as it only occupies such a tiny space in the book and I never pay attention to it.

I put down use a kelvin thermometer and a Celsius thermometer to measure the temperature of a fixed amount of gas respectively.... then work out the difference....the subtract the difference from 0......

Bull****. If a kelvin thermometer is based on the concept of absolute zero...then what is the point to use it to determine absolute zero... I rethink after the exam and feel the answer is stupid...

I did also put down absolute zero is when the mean kinetic energy of all gas molecules becomes zero so does their root mean square speed is zero so it's actually impossible. And the experiment should be carried at constant pressure with a fixed mad and volume of gas. Take repeats and average. Honestly how many marks will I lose for this question I feel so regretful and scared
Lots of people ballsed up, don't worry. Just wait until results day.

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6. For the 2 six markers for the main paper and then astronomy i put:
>have a system that you can change the temperature of a gas in a fixed container (therefore volume and moles is constant).
> starting from room temperature cool the gas and measure the pressure with a pressure gauge.
>Plot a graph of Pressure (Y) by Temperature (x) and draw a line of best fit, then extrapolate the line back to the x axis and this is where pressure will be 0 (the x axis was in celsius)
>"This is the temperature where there is no pressure. This means the particles are stationary as pressure arises from the particles colliding with the pressure gauge" (or some **** like that)

Astronomy:
>measure time period by looking for the time between 2 similar peaks.
>Measure the tangential speed for the orbit of each star by looking at the red shift.
>i then went on to explain how you could work out the radius of the orbit around the common centre of mass, as you have the tangential speed and you have the time period so just apply some phy4 oscillations equations etc (did anyone else say this?)
7. (Original post by JxckWilliams)
For the 2 six markers for the main paper and then astronomy i put:
>have a system that you can change the temperature of a gas in a fixed container (therefore volume and moles is constant).
> starting from room temperature cool the gas and measure the pressure with a pressure gauge.
>Plot a graph of Pressure (Y) by Temperature (x) and draw a line of best fit, then extrapolate the line back to the x axis and this is where pressure will be 0 (the x axis was in celsius)
>"This is the temperature where there is no pressure. This means the particles are stationary as pressure arises from the particles colliding with the pressure gauge" (or some **** like that)

Astronomy:
>measure time period by looking for the time between 2 similar peaks.
>Measure the tangential speed for the orbit of each star by looking at the red shift.
>i then went on to explain how you could work out the radius of the orbit around the common centre of mass, as you have the tangential speed and you have the time period so just apply some phy4 oscillations equations etc (did anyone else say this?)
Do you remember if they asked us to calculate the speed and period or did they just ask how you would calculate it? I just explained the formulas and didn't substitute in the numbers to work out the values.
8. (Original post by Reverse Swing)
Do you remember if they asked us to calculate the speed and period or did they just ask how you would calculate it? I just explained the formulas and didn't substitute in the numbers to work out the values.
It said describe how the speed and period would be determined from the graphs and include "suitable calculations" in your answer.

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9. (Original post by CD223)
AQA, OCR and Edexcel do theirs the day before. WJEC is different each year - sometimes not updating until actual results day.

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yeah, that's more like it
10. (Original post by Mehrdad jafari)
yeah, that's more like it
How did you feel PHYA5 was compared to PHYA4?

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11. (Original post by xuyixuanpbs)
Yeah right I think I wrote sth stupid in physics exam, a 6 marks question asking how to determine absolute zero. I never revise it as it only occupies such a tiny space in the book and I never pay attention to it.

I put down use a kelvin thermometer and a Celsius thermometer to measure the temperature of a fixed amount of gas respectively.... then work out the difference....the subtract the difference from 0......

Bull****. If a kelvin thermometer is based on the concept of absolute zero...then what is the point to use it to determine absolute zero... I rethink after the exam and feel the answer is stupid...

I did also put down absolute zero is when the mean kinetic energy of all gas molecules becomes zero so does their root mean square speed is zero so it's actually impossible. And the experiment should be carried at constant pressure with a fixed mad and volume of gas. Take repeats and average. Honestly how many marks will I lose for this question I feel so regretful and scared
to be honest that's not that bad, at least you tried take the short cut but you neglected that the kelvin temperature was calibrated on the basis of absolute zero itself. You do get some marks for saying that the mean kinetic energy of the molecules of the gas reaches zero, regardless of whether the mean or the root mean square speed of the molecules is zero.

Don't worry about it man. of course some people might think they have done well on the six marker but when it comes to looking at the mark scheme then the situation is different.
12. (Original post by CD223)
How did you feel PHYA5 was compared to PHYA4?

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I think on average it was quite the same. The six marker for turning points was in the middle of the questions and so because I spent more time on it that i should have, i ended up having not enough time for the last question so i missed a few marks. I think I was quite obsessed with six marker in turning points but I'm sure i got the marks I wanted to

How did you find it?
13. (Original post by Mehrdad jafari)
I think on average it was quite the same. The six marker for turning points was in the middle of the questions and so because I spent more time on it that i should have, i ended up having not enough time for the last question so i missed a few marks. I think I was quite obsessed with six marker in turning points but I'm sure i got the marks I wanted to

How did you find it?
Ah that sounds like the opposite of me! I did all of the other questions in both papers before attempting both six markers back to back haha!

It was an.. Interesting paper. Made so many mistakes on both units so I think I'll get an A instead of an A* :/ but who knows

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14. Thanks
15. (Original post by CD223)
Ah that sounds like the opposite of me! I did all of the other questions in both papers before attempting both six markers back to back haha!

It was an.. Interesting paper. Made so many mistakes on both units so I think I'll get an A instead of an A* :/ but who knows

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The same here. I did make so many mistakes too but to be honest I'm not very surprised by that as I literally closed my eyes and hoped that whatever i wrote was correct lol

edit: some of my class mates doing astro did find the astro unit somewhat weird though
16. (Original post by Sbarron)
Thanks
no worries!
17. (Original post by Mehrdad jafari)
no worries!
You get the papers today right?
18. (Original post by ubisoft)
You get the papers today right?
oh, no. sorry i didn't realise yesterday was Friday. I meant the Saturday next week because yesterday i would have said I will have the paper by tomorrow and not Saturday. I said Saturday because i looked at the date on my calender
19. (Original post by Mehrdad jafari)
oh, no. sorry i didn't realise yesterday was Friday. I meant the Saturday next week because yesterday i would have said I will have the paper by tomorrow and not Saturday. I said Saturday because i looked at the date on my calender
oh alright haha
20. (Original post by Mehrdad jafari)
The same here. I did make so many mistakes too but to be honest I'm not very surprised by that as I literally closed my eyes and hoped that whatever i wrote was correct lol

edit: some of my class mates doing astro did find the astro unit somewhat weird though
Hahahah yeah I know what you mean. Astro was weird compared to previous years. I'm hoping it's a fairly low boundary like last year.

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