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

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Original post by KalemParsons
Surely you would add 1 to 2.57 AU? The max distance is going to be when the earth and asteroid are aligned and at either side of the sun?


Yeah that's correct
Reply 2781
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k9000
2
Original post by Faaiz Shah
They better accept a large range.


24 V did they ask for 3sf??
Grade boundaries

65 A*
59 A
53 B
47 C
For the density question was it just Au/volume of nuclear using the radias we calculates???
for density did anyone get 1.63*10^17?
How many raw marks for full ums do you think? (Thermal+astro combined)
What is it usually??
Guys what was the range of
- Alpha
- Beta
radiation?

I wrote 0.1 to 1m for alpha and 10-15m for beta had no idea :frown:
Original post by RemainSilent
for density did anyone get 1.63*10^17?

I agree


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Original post by k9000
The value of d.. Aqa moving snakey as i realised at the last minute that the frequencies cancel


Cwap i got 10... I swear i checked it as well. And it gave 0.4 so ...
Original post by QueNNch
Guys what was the range of
- Alpha
- Beta
radiation?

I wrote 0.1 to 1m for alpha and 10-15m for beta had no idea :frown:


0.1 for alpha
1 for beta
Did u choose x Rays ?


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Reply 2790
Avatar for bwr19
bwr19
2
Original post by KalemParsons
Surely you would add 1 to 2.57 AU? The max distance is going to be when the earth and asteroid are aligned and at either side of the sun?


I now realise that it should've been that, yeah. Ah well.
Original post by Ninja_heel
Grade boundaries

65 A*
59 A
53 B
47 C


No way . Atleast 62 for an a*.
Original post by QueNNch
Guys what was the range of
- Alpha
- Beta
radiation?

I wrote 0.1 to 1m for alpha and 10-15m for beta had no idea :frown:


Alpha is 0.1m and beta 1m
Original post by QueNNch
Yep you add the distances because maximum distance is when earth is on opposite side of the vestra(?) asteroid.
Something like 3.57AU

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but I swear it was on a belt between Mars and Jupiter (I drew a diagram)
Original post by bwr19
I now realise that it should've been that, yeah. Ah well.


How do you know that ever happens? You're not told that. maybe earth and the asteroid are always at right angles to the Sun.
Did we all get Q = mc delta t + ml = 47000J for lead?
Original post by king cobra

Did u choose x Rays ?


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I can't remember can you remind me the question please

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Original post by king cobra
0.1 for alpha
1 for beta
Did u choose x Rays ?


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Pretty sure it's alpha isn't it
For the q where people got 5000K can someone explain how you got that? People I spoke to at school all got 16000K
The first question


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