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# AQA Physics Unit 1 PHYA1 20th May 2013 Watch

1. (Original post by Jimmy20002012)
Here is the link to the paper:

http://filestore.aqa.org.uk/subjects...W-QP-JUN10.PDF

How would you do 3 bii and 3ci, never come across a question like this before???

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3) bii) You know the total energy incident per second is due to the number of photons incident per second, so the total energy = number of photons x energy of one photon

3) c) i) This is assuming almost like the an electron gets "charged" with energy by the light wave (by the wave model). You know what the work function is (i.e. the energy to which the electron needs to get "charged" up to to be liberated) and you know what the energy incident per second is (i.e. the power) so use P = E/ t and rearrange
2. (Original post by x-Sophie-x)
I really hate it when you appear out of nowhere, and answer what seems like every maths related question!

Indeed it is xD
But I still see the same thing!

Is the second answer 37.5 Ohms by any chance?

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I'm like a ninja, I'm here there and everywhere, I'm omniscient

How do you still see the same thing?! xD The trick is the system of resistors is just arranged in a way that doesn't look like they're in parallel/ series but really they are - more to do with geometry than electricity tbh because if you just know how to rearrange you can get on to the monkey business

That's what I get
3. (Original post by Jimmy20002012)
Here is the link to the paper:

http://filestore.aqa.org.uk/subjects...W-QP-JUN10.PDF

How would you do 3 bii and 3ci, never come across a question like this before???

Posted from TSR Mobile
To work out the number of incident photons per second, you divide the rate by the energy of the photon.

3 x 10^-10/9.95 x 10^-19
=3.02 x 10^8

J/Js^-1 so the joules cancel out.

For the next question, you want J/Js^-1 which simplifies to 1/s^-1, as you're calculating the minimum time. This is basically dividing the energy by the rate to find the time.

So, 6.8 x 10^-19/3 x 10^-22
= 2.27 x 10^3.

That's just how I think about it

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4. (Original post by x-Sophie-x)
...
That's interesting...do you normally work out what calculations you need to do through dimensional analysis?
5. (Original post by Felix Felicis)
That's interesting...do you normally work out what calculations you need to do through dimensional analysis?
I have no idea what dimensional analysis is xD

But if its what I think, then yes, I usually try to do calculations that way :P makes my brain hurt sometimes ^.^

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6. (Original post by x-Sophie-x)
I have no idea what dimensional analysis is xD

But if its what I think, then yes, I usually try to do calculations that way :P makes my brain hurt sometimes ^.^

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Yeah if what you think what I think is playing around with units then yeah. xD That's interesting, I've never seen anyone do it like that before. I try it sometimes if I really don't see what a question wants from me and hope the numbers work out. xD
7. (Original post by Felix Felicis)
I'm like a ninja, I'm here there and everywhere, I'm omniscient

How do you still see the same thing?! xD The trick is the system of resistors is just arranged in a way that doesn't look like they're in parallel/ series but really they are - more to do with geometry than electricity tbh because if you just know how to rearrange you can get on to the monkey business

That's what I get
Okay, well I saw a little difference, hence the change in my second answer

Yeah, I see now, I very much dislike geometry and physics in the same question

And part one gives an answer of 50 Ohms?

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8. (Original post by x-Sophie-x)
Okay, well I saw a little difference, hence the change in my second answer

Yeah, I see now, I very much dislike geometry and physics in the same question

And part one gives an answer of 50 Ohms?

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Haha, fair do's ^^ This one isn't even that bad tbh...when you get a cubic system of wires with one resistor on each side of the cube, that....that's when **** hits the fan. xD

Correct-o-mundo!
9. (Original post by Felix Felicis)
Yeah if what you think what I think is playing around with units then yeah. xD That's interesting, I've never seen anyone do it like that before. I try it sometimes if I really don't see what a question wants from me and hope the numbers work out. xD
Ah right
Didn't realise I did things in weird ways xD

Obviously I try and use equations where possible! But the P=E/t equation didn't occur to me.

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10. (Original post by x-Sophie-x)
Ah right
Didn't realise I did things in weird ways xD

Obviously I try and use equations where possible! But the P=E/t equation didn't occur to me.

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Hahaha, tbh, I didn't realise pissing around with units actually had a proper name until I saw a thread on here a while ago. xD But yeah, I recall doing it at GCSE as well to check answers and stuff. Not weird, just different.

Fair enough It just popped out at me, going by the wave model
11. (Original post by Felix Felicis)
Haha, fair do's ^^ This one isn't even that bad tbh...when you get a cubic system of wires with one resistor on each side of the cube, that....that's when **** hits the fan. xD

Correct-o-mundo!
For you maybe!
I'd never have rearranged it correctly. Electricity is such a mehh topic.

I shall look forward to it!

Yaay xD Thanks for the help.

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12. (Original post by x-Sophie-x)
For you maybe!
I'd never have rearranged it correctly. Electricity is such a mehh topic.

I shall look forward to it!

Yaay xD Thanks for the help.

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Haha, sorry
Mmhmm, it's alright, just a bit dry...Organics, now that's a mehh topic
Oh yeah, I went there
Haha, good luck When is this exam btw?

No worries
13. (Original post by Felix Felicis)
Haha, sorry
Mmhmm, it's alright, just a bit dry...Organics, now that's a mehh topic
Oh yeah, I went there
Haha, good luck When is this exam btw?

No worries
Haha :L

How dare you!

Thank you!
It's on Monday

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14. Does anyone know an easy way of remembering the particles stuff?
15. (Original post by Me123456789)
Does anyone know an easy way of remembering the particles stuff?
For the quark combinations of pions and kaons, my teacher suggested 'don't stand under dark umbrellas'

Not sure if that will be any help but hey xD

I don't know of anything else

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16. How's everyones revision going?
The big 6/8 mark question is going to kill me! Hate writing about experiments :P

17. hey I am also doing this exam

1) is it me or is most of the stuff needed for particles on the formula sheet anyway?
2) does anyone have any tips on learning the units e.g. mega milli?
3) I'm stuck in working out the voltage for C-D (attached)
18. Does anybody have a good resource for learning to draw circuits? It's a major weakness of mine.
19. does anybody know where I could get a list of experiments which they could ask about in those long six mark questions because I've revised the ones which have appeared in past papers but of course those are the ones less likely to appear :/
20. (Original post by Me123456789)
Does anyone know an easy way of remembering the particles stuff?

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