The Physics PHYA2 thread! 5th June 2013

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Reply 280

Anonymous1717

Also on the June 11 paper, how do you do 5d? Any explanations would be greatly appreciated. :smile:

Reply 281

natninja

Original post by Anonymous1717

Also on the June 11 paper, how do you do 5d? Any explanations would be greatly appreciated. :smile:

I sat that paper, if you can post the question up I can help you.

Reply 282

rainerised

how do you do jan 12 question 7b? The wave travels to the right.
Describe how the vertical displacement of the knot varies over the next complete cycle

(edited 10 years ago)

wave2.png22.1KB

Reply 283

Anonymous1717

Original post by natninja

I sat that paper, if you can post the question up I can help you.

http://laganphysics.weebly.com/uploads/7/5/0/8/7508207/aqa-phya2-w-qp-jun11.pdf

Also 7a, what would the graph be like?

Thanks in advance.

Reply 284

natninja

Original post by Anonymous1717

http://laganphysics.weebly.com/uploads/7/5/0/8/7508207/aqa-phya2-w-qp-jun11.pdf

Also 7a, what would the graph be like?

Thanks in advance.

for 5d it's just quoting and applying the formula sin(c)=n₁/n₂

&7a is a written 6 marker and there's no graph required...

So I assume you meant 6a which is literally a plot the points and draw a line. Should start as a steep curve and then go shallower towards the top as the metal starts flowing plasticly.

Reply 285

Anonymous1717

Original post by natninja

Well 7a is about the formula w=(wavelength x D)/s and the mark scheme refers to some sort of way to determine wavelength from a graph. Would you like me to link you the mark scheme?

Reply 286

VV.KKGSR

Original post by RU486

Could someone help on question 4bi on the June 10 paper please?

Even though it's asking for kinetic energy, you have to use the potential energy formula mgh, so you just do 55*9.81*3.2

Also do you know how to do question 6di from this paper? It's only 1 mark but still can't understand it?

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Reply 287

natninja

Original post by Anonymous1717

Well 7a is about the formula w=(wavelength x D)/s and the mark scheme refers to some sort of way to determine wavelength from a graph. Would you like me to link you the mark scheme?

hmmm let me think a min, you have a formula for the Young double slit experiment, therefore some of the parameters in it could be used for a graph, how about fringe position versus slit seperation? Or even from your fomula a graph such that the gradient is proportional to w/s or wD/s? Bear in mind that the formula is only valid for small angles :P (and why would you use Young's slits for that anyway... a grating monochromator (uses diffraction gratings... reflection ones rather than transmission ones mind) or a Lloyd's mirror apparatus would give better results...)

(edited 10 years ago)

Reply 288

Anonymous1717

Original post by natninja

Thanks for your help!

Reply 289

natninja

Original post by Anonymous1717

Thanks for your help!

No problem :smile:

I didn't do as well on that paper as I did in the jan2012 retake

Spoiler

Reply 290

Jimmy20002012

Original post by StalkeR47

It could be on the young's double slit experiment or the reflection/refraction and how do they occur etc. :s-smilie:

EDIT: It is more likely to be on waves eg, progressive waves such as transverse and longitudinal.

Hey could you answer that question above physics god, thanks :biggrin:

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Reply 291

StalkeR47

Original post by Jimmy20002012

In the spec we don't we need to know about the experiment of reflection or refraction. I think Young modulus will come up, but you know AQA they can unpredictable :wink:

Just another quick question, when you given say the critical angle, and you know there is a triangle, could you calculate refractive angle by doing 180-90-critical angle?

Posted from TSR Mobile

Hey sorry, I was taking a break. Ok, amm.. I am not sure about this bit. Is there a particular question on the past paper? Let me know. It is quiet hard to understand what you are saying. And I think, It depends on the diagram shown.

Reply 292

Randy123

could someone please explain to me what is meant by coherent

Reply 293

StalkeR47

Original post by Randy123

could someone please explain to me what is meant by coherent

Coherent meaning: Two waves are coherent if they have a constant phase difference and same frequency. That is it. For example, the young's double slit experiment.

Reply 294

Anonymous1717

Original post by natninja

No problem :smile:

I didn't do as well on that paper as I did in the jan2012 retake

Spoiler

Why do people use "spoiler"?

Reply 295

susanjan123

ok first time im using this but i hope im doing it right :s-smilie:

can anyone answer the Q to jan2012 question 5
preferably draw it :colondollar:

THANK YOU

Reply 296

StalkeR47

Original post by Jimmy20002012

Hey could you answer that question above physics god, thanks :biggrin:

Posted from TSR Mobile

I think if you know the critical angle, angle of refraction can be found by doing the following. 90degrees take away critical angle = angle of refraction. So, you are perfectly correct! Sorry, the first time I was confused. :smile:

Reply 297

natninja

Original post by Anonymous1717

Why do people use "spoiler"?

because not everyone bothers to look under it :P

Reply 298

Jimmy20002012

Original post by StalkeR47

Bo problem :smile:

I have attached the question where you have to find the angle of incidence.

And also could you help the on 2c on the attached question, why doesn't the energy convert to kinetic energy?

ImageUploadedByStudent Room1370034025.255389.jpg