AQA AS physics paper 1 unofficial markscheme - 14 May 2019

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Shilen07
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#1
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#1
Any one happy to upload the unofficial markscheme here
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username4167452
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#2
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#2
yhh if we can get it like last years with the questions on it too
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LivanC21
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#3
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#3
Question One - Work our specific charge of Duetirium 1.6 x 10^-19 / 2x 1.674 x 10^-27

= 4.78 x 10^7
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LivanC21
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#4
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#4
Tritium cannot go through alpha decay - due to baryon number conservation
Beta decay forms helium -3 so beta decay is the right answer
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detdom
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#5
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#5
It said that an isotope is formed and both alpha and beta decay affect proton number, so must be electron collision.
(Original post by LivanC21)
Tritium cannot go through alpha decay - due to baryon number conservation
Beta decay forms helium -3 so beta decay is the right answer or whatever the third option was.
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aqaboy
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(Original post by detdom)
It said that an isotope is formed and both alpha and beta decay affect proton number, so must be electron collision.
No I think you misread the question. I believe it was asking for a decay which will produce another element. Only beta minus decay is possible.
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shivthakur
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#7
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(Original post by aqaboy)
No I think you misread the question. I believe it was asking for a decay which will produce another element. Only beta minus decay is possible.
yeah you are correct also it was a 3 marker so the better answer would be to say why electron collision isnt possible as it would form a atom with zero protons which is not possible so beta decay is right
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shivthakur
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#8
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#8
anyone else find that super easy the only question i messed up on was the resistance question as i used 2 into emf thinking it was 2 cells instead of one battery and that messed me up but everything else was pretty fine
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shivthakur
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#9
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#9
what did everyone get for the energy stored as elastic strain energy and if you could reach 50m
i said you couldnt because mgh for 50m is higher than the elastic strain energy at the begining so you cant have energy created
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angad1102
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#10
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#10
yeah I got the same
(Original post by shivthakur)
what did everyone get for the energy stored as elastic strain energy and if you could reach 50m
i said you couldnt because mgh for 50m is higher than the elastic strain energy at the begining so you cant have energy created
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angad1102
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#11
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#11
What did you guys get for the resistance question, the one with the LED and the graph?
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Chelsea Kaye
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#12
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#12
****ed it i got like 50 ohms
(Original post by angad1102)
What did you guys get for the resistance question, the one with the LED and the graph?
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arothman101
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#13
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#13
I got something in the 300 s can remember exact number
(Original post by Chelsea Kaye)
****ed it i got like 50 ohms
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shivthakur
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#14
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#14
is this the same angad from desc
(Original post by angad1102)
What did you guys get for the resistance question, the one with the LED and the graph?
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angad1102
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#15
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#15
yes boss
(Original post by shivthakur)
is this the same angad from desc
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Lou1331
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#16
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#16
I also got Around 50
(Original post by arothman101)
I got something in the 300 s can remember exact number
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Germa
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#17
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(Original post by shivthakur)
what did everyone get for the energy stored as elastic strain energy and if you could reach 50m
i said you couldnt because mgh for 50m is higher than the elastic strain energy at the begining so you cant have energy created
Had the exact same answer
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Germa
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#18
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#18
So the emf was 7.4V therefore that is applied to each branch . Take away the 2.2v leaving 5.2 through the resistor , you had it’s current 15x10^-3 so to get r you divided v by the current . Anyone get the same ?
(Original post by shivthakur)
what did everyone get for the energy stored as elastic strain energy and if you could reach 50m
i said you couldnt because mgh for 50m is higher than the elastic strain energy at the begining so you cant have energy created
Had the exact same answer
(Original post by shivthakur)
is this the same angad from desc
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wordisc
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#19
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#19
What was the 6 mark question on?
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henrythegury
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#20
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(Original post by wordisc)
What was the 6 mark question on?
On core cladding and modal dispersion and how to avoid it.
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