PHYA5 ~ 20th June 2013 ~ A2 Physics

ImageUploadedByStudent Room1370550429.058965.jpg

This is Flemings right hand rule right?? Got me confused

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Reply 382

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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Reply 383

Dirtybit

Ideal Gas MS (1).doc107.0KB

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 :biggrin:

Smith

Markscheme prwetty please

Reply 384

cooldudeman

18

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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Reply 385

smith50

6

Original post by posthumus

Brilliant, thank you so much ! :biggrin:

May I ask if there's also a mark scheme ?

Sorry for the late reply here are the markschemes as requested :smile:

Smith

KE ms (1).doc59.9KB

Nuclear Energy MS (3).doc85.5KB

Radioactivity MS (5).doc174.1KB

Relativity MS (6).doc83.5KB

Thermal Physics MS (1).doc69.6KB

Reply 386

smith50

6

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

Wave Particle Duality (5).doc228.9KB

Wave Particle Duality MS (2).doc98.3KB

Reply 387

cooldudeman

18

Original post by smith50

So i found some questions on turning points here it is hope this helps.
Smith

Thanks a bunch

Reply 388

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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Reply 389

Jack93o

15

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

(edited 10 years ago)

Reply 390

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 :tongue:

Original post by smith50

Sorry for the late reply here are the markschemes as requested :smile:

Smith

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

Thanks again :biggrin:

(edited 10 years ago)

Reply 391

smith50

6

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 :tongue:

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

Thanks again :biggrin:

Could i quote you if i get stuck ?
Smith

Reply 392

Original post by smith50

Could i quote you if i get stuck ?
Smith

Yes of course :smile:

I would actually appreciate that :tongue:

Hey & I'm from West London too !

Reply 393

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 :tongue:

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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Reply 394

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 :smile:

Reply 395

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 :smile:

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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Reply 396

Dirtybit

Original post by smith50

So i found some questions on turning points here it is hope this helps.
Smith

Your such a Boss mate!

Reply 397

Dirtybit

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 :biggrin:

Smith

Can i just ask are these Spec B questions or just Old spec A ones ?

Reply 398

cooldudeman

18

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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(edited 10 years ago)

1370566579790.jpg57.7KB

Reply 399