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

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justalawyer1998

In physics, a field is a physical quantity that has a value for each point in space and time. Source: Wikipedia

Yeah, pretty sure you can say 'waves/vibrations' as well since waves are just synchronised oscillations of fields

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Reply 741

wrekin98

Original post by ManOfJustTin

I put dark matter. I think the Big Bang caused the expansion but they don't know why it's accelerating hence dark matter?

I put dark energy. Not sure im right though.

Reply 742

particlestudent

@kingaaran @Mango Milkshake

What did you guys put for the test to see if it emitted beta as well?

Reply 743

justalawyer1998

Original post by kingaaran

can't remember it was work function / stopping potential.

I think around 22? Idk - it was in the 20s

I got 27

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Reply 744

txnilxnur

Original post by particlestudent

Idek

, I put that in brackets though and said 'some' in words, because I couldn't remember the exact number :angry:

I thought it was 2000 lmao, swear that's what it says in the textbook

Reply 745

BigDaddy97

Original post by kingaaran

can't remember it was work function / stopping potential.

I think around 22? Idk - it was in the 20s

Hmm got 25 🤔

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Reply 746

justalawyer1998

Original post by particlestudent

@kingaaran @Mango Milkshake

What did you guys put for the test to see if it emitted beta as well?

I said put a 3mm aluminium sheet to see if the count rate decreases

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Reply 747

RUNSran

Original post by HughBax

What did people get for the penultimate question on Astro? (the distance to the Quasar) I think I had something like 2.14 x10^14 AU but I may have remembered wrong

yeah i got same

Reply 748

FireBLue97

Original post by kingaaran

can't remember it was work function / stopping potential.

I think around 22? Idk - it was in the 20s

defo 25 micor seconds this had to be in micro seconds

Reply 749

BigDaddy97

Original post by FireBLue97

defo 25 micor seconds this had to be in micro seconds

Nice

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Reply 750

Mango Milkshake

Original post by particlestudent

@kingaaran @Mango Milkshake

What did you guys put for the test to see if it emitted beta as well?

i said move it further away past the range of beta. If the count rate drops then theres beta if not then no beta is emitted

wbu?

Reply 751

username1884583

Original post by kingaaran

I don't think that'd get marks because those two things can't exactly have a phase relationship

probably not .

" Expressions for the electric and magnetic fields in free space contain the electric permittivity ε₀ and magnetic permeability μ₀ of free space. As indicated in the section on electric and magnetic constants, these two quantities are not independent but are related to "c", the speed of light and other electromagnetic waves."

source: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html

Reply 752

Questioner1234

I got 125 MeV and then from the graph 128

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Reply 753

particlestudent

Original post by Mango Milkshake

i said move it further away past the range of beta. If the count rate drops then theres beta if not then no beta is emitted

wbu?

I said plot a graph of count rate against 1/r^2 and it should be a straight line if it is only gamma, but if it is beta it will not be a straight line.

This better be accepted :angry:

Reply 754

Questioner1234

Original post by Mango Milkshake

i said move it further away past the range of beta. If the count rate drops then theres beta if not then no beta is emitted

wbu?

I put same and said can achieve same effect by using 5mm of aluminium

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Reply 755

CourtlyCanter

Original post by duncant

is it just our class in the whole of the UK that does medical physics?

I was the only one in my school to do it as I learnt it myself because the teacher we had for astrophysics was awful. This year's paper was hard. Do you remember your answers to any of the questions?

Reply 756

justalawyer1998

Original post by Questioner1234

I got 125 MeV and then from the graph 128

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Nah it was 127/128 from the calculation

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Reply 757

marioman

Original post by Mango Milkshake

i said move it further away past the range of beta. If the count rate drops then theres beta if not then no beta is emitted

wbu?

The count rate is going to drop when you move it further away regardless of whether there's beta emission or not.

Reply 758

HughBax

Original post by wrekin98

I put dark energy. Not sure im right though.

Dark Energy is responsible for the acceleration of the Universe's expansion. Although no one has any idea what it is so the question was a bit odd really as no one knows why expansion is accelerating.