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# The Physics PHYA2 thread! 5th June 2013 watch

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1. (Original post by StalkeR47)
Amm.. In my revision book, it says partial internal reflection occurs when incident angle is less than or equal to the critical angle. I have nelson thornes and it is for AQA exam board only.
Oh... I got the same textbook so had a look and yeah, you were right.

I haven't seen any questions in past papers on that though...
2. (Original post by StalkeR47)
like this! The bottom spectrum.
Thank you so much! Exactly what i was looking for
3. Does anyone have a list of all the experiments they could potentially ask us about?

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4. (Original post by Jack93o)
so you would only get partial reflection if the angle of incidence is exactly equal to the critical angle?

what if the ray is refracted through, do you still get a bit of reflection?
Yes, but not much (second question)
5. (Original post by Jack93o)
so you would only get partial reflection if the angle of incidence is exactly equal to the critical angle?

what if the ray is refracted through, do you still get a bit of reflection?
No, you get partial internal reflection when the incident angle is less than or equal to the critical angle. And you get total internal reflection when the incident angle is bigger than the critical angle. Is that clear?
Oh... I got the same textbook so had a look and yeah, you were right.

I haven't seen any questions in past papers on that though...
HAHA. It is ok.
7. (Original post by masryboy94)
ooo i can tell miss overlord !! lool :P
Wow, it's changed xD Didn't realise that :L
8. (Original post by h94k)
Thank you so much! Exactly what i was looking for
No probs!
9. Predictions?

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10. (Original post by danlocke)
Predictions?

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Yes of course! Everything will come up (I predict). So, you will have to revise everything.

11. can someone help with this I thought I would use sinx=opp/hyp but they used something different
Attached Images

12. PAST PAPER MARKS:

Jan 10: 58 - 116 UMS
June 10: 60 - 120 UMS
Jan 11: 59 - 114 UMS
June 12: 62 - 120 UMS
Jan 13: 54 - 105 UMS

Hoping papers nicer than the Jan 13 one. Last question wasn't nice

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13. Does anyone have a model answer for any of the 6 markers on waves ie slits, diffraction gratings or stationary? As soon as I see a question asking me to explain what happens my head goes blank!

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14. (Original post by BenChard)

can someone help with this I thought I would use sinx=opp/hyp but they used something different
What is the question? I can only see the diagram and it is up-side-down.
15. (Original post by StalkeR47)
Yes of course! Everything will come up (I predict). So, you will have to revise everything.
Sorry to both you again On jan 13 paper on 2bi, how do you work out the weight component?

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16. (Original post by StalkeR47)
What is the question? I can only see the diagram and it is up-side-down.
sorry it's show the component of the weight along the slope is 0.06
17. (Original post by SortYourLife)
PAST PAPER MARKS:

Jan 10: 58 - 116 UMS
June 10: 60 - 120 UMS
Jan 11: 59 - 114 UMS
June 12: 62 - 120 UMS
Jan 13: 54 - 105 UMS

Hoping papers nicer than the Jan 13 one. Last question wasn't nice

Posted from TSR Mobile
Jan 13 last q? Common! It was the easiest question. But you are doing really well! Keep it up!
18. (Original post by Jimmy20002012)
Sorry to both you again On jan 13 paper on 2bi, how do you work out the weight component?

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You wanna try to draw a triangle, with the weight as the hypotenuse, then you should be able to work out the angle and thus, the component parallel and perpendicular to the plane.
19. (Original post by Jimmy20002012)
Sorry to both you again On jan 13 paper on 2bi, how do you work out the weight component?

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weight is given by, mgsinx.
20. (Original post by BenChard)
sorry it's show the component of the weight along the slope is 0.06
Could you post a diagram with the question you need help with? Thanks.

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