cooldudeman
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#381
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#381
(Original post by smith50)
Okay here are the documents hope you find them useful
I am doing them aswell let me know if you get stuck
Smith
I mean the huguans topic with all the radio waves and and light as a wave and particle and the tunnelling. Im really need exam practise on that.

Btw do you have answers to the ones you posted?

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cavalera94
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#382
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Name:  ImageUploadedByStudent Room1370550429.058965.jpg
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This is Flemings right hand rule right?? Got me confused


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cavalera94
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#383
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What I'm asking really is whether, the flow of current is defined as the way in which the electrons move? So the alpha particle is a current moving towards the left?


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Dirtybit
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#384
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#384
(Original post by smith50)
Okay here are the documents hope you find them useful
I am doing them aswell let me know if you get stuck
Smith
Markscheme prwetty please
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cooldudeman
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#385
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#385
(Original post by cavalera94)
What I'm asking really is whether, the flow of current is defined as the way in which the electrons move? So the alpha particle is a current moving towards the left?


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Use rh for negative particles and lh for positive

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smith50
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#386
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#386
(Original post by posthumus)
Brilliant, thank you so much !

May I ask if there's also a mark scheme ?
Sorry for the late reply here are the markschemes as requested
Smith
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smith50
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#387
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#387
(Original post by cooldudeman)
I mean the huguans topic with all the radio waves and and light as a wave and particle and the tunnelling. Im really need exam practise on that.

Btw do you have answers to the ones you posted?

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So i found some questions on turning points here it is hope this helps.
Smith
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cooldudeman
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#388
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(Original post by smith50)
So i found some questions on turning points here it is hope this helps.
Smith
Thanks a bunch
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cavalera94
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#389
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#389
(Original post by cooldudeman)
Use rh for negative particles and lh for positive

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That's not correct?


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Jack93o
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#390
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#390
why is it that for medical diagnosis, lower half life of a substance would minimize the radiation dose recieved by the patient?

if the half-life is short, doesn't that just mean that the radiation dose emitted is over a shorter time?

the amount of radiation is emitted is still the same, the only difference is the duration over which its emitted, right?

I don't understand, if anything, a shorter half life makes the substance more dangerous, because that increases the activity (intensity of radiation), whereas a longer half life would mean for the same dose of radiation, its delivered over a longer period of time
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posthumus
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(Original post by cavalera94)
That's not correct?


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Looks correct... I think one amp is defined as 1 unit charge per second. That unit charge being positive. So current for positive particles will be in the direction of travel & for negative particles in the opposite direction.

EDIT: Tried the hand rule, having second thoughts

(Original post by smith50)
Sorry for the late reply here are the markschemes as requested
Smith
I owe you lots! I can actually make a real start on this unit now... these questions look good

Thanks again
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smith50
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(Original post by posthumus)
Looks correct... I think one amp is defined as 1 unit charge per second. That unit charge being positive. So current for positive particles will be in the direction of travel & for negative particles in the opposite direction.

EDIT: Tried the hand rule, having second thoughts



I owe you lots! I can actually make a real start on this unit now... these questions look good

Thanks again
Could i quote you if i get stuck ?
Smith
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posthumus
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#393
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(Original post by smith50)
Could i quote you if i get stuck ?
Smith
Yes of course I would actually appreciate that

Hey & I'm from West London too !
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cavalera94
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#394
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(Original post by posthumus)
Looks correct... I think one amp is defined as 1 unit charge per second. That unit charge being positive. So current for positive particles will be in the direction of travel & for negative particles in the opposite direction.

EDIT: Tried the hand rule, having second thoughts
It can't be true because that would mean that whatever way the current is going (the charge of the particle) then it will always go up!



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posthumus
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#395
(Original post by cavalera94)
It can't be true because that would mean that whatever way the current is going (the charge of the particle) then it will always go up!



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Not necessarily.... depends on the direction of the magnetic field.

& if your talking about the hand rule cooldudeman suggested, I have changed my mind again... I think it is right. Well you can certainly look at it that way if you wish
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cavalera94
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#396
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(Original post by posthumus)
Not necessarily.... depends on the direction of the magnetic field.

& if your talking about the hand rule cooldudeman suggested, I have changed my mind again... I think it is right. Well you can certainly look at it that way if you wish
It's not right. As I said before, if you use both hands and put them next to each other in the same position then it doesn't work. I'm pretty sure it's left hand rule like you said and the direction of current is positive charge and that would move upwards in a magnetic field into the page.


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Dirtybit
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#397
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#397
(Original post by smith50)
So i found some questions on turning points here it is hope this helps.
Smith
Your such a Boss mate!
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Dirtybit
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#398
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(Original post by smith50)
Okay here are the documents hope you find them useful
I am doing them aswell let me know if you get stuck
Smith
Can i just ask are these Spec B questions or just Old spec A ones ?
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cooldudeman
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#399
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Can someone check if these arw correct. I don't have MS. Are you supposed to turn Celsius to kelvin when finding heat capacity?
First part, I meant to write
c=937J/kgK
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posthumus
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(Original post by cooldudeman)
Can someone check if these arw correct. I don't have MS. Are you supposed to turn Celsius to kelvin when finding heat capacity?
First part, I meant to write
c=937J/kgK
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For the first one I am getting c=4140 :confused:

And no because your finding the difference whether it's in celsius or kelvin does not matter... by the way I did the same calculation as you in the first part but replaced that 298 with 80

The rest looks right
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