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# The Physics PHYA2 thread! 5th June 2013 Watch

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1. (Original post by taliaa)
please help! i seem to be losing marks on all of the equations that involve trigonometry rules. I remember s=o/h c=a/h t=o/a from maths and am confident with this but seem to be using the wrong one (mixing up between sin and cos)
e.g. jan 2013 - q 2 b i, i am conviced you have to use cos but the mark scheme says sin?! why is it sin and not cos?
thaaaanks!!
Hi! Just remember this. To find Adjacent (in a right angle triangle) use cos. To find opposite, use sin. Is that ok?
2. L
(Original post by StalkeR47)
Hi! Just remember this. To find Adjacent (in a right angle triangle) use cos. To find opposite, use sin. Is that ok?
Hey how do you know when partial internalreflection occurs?

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3. Does anyone need any help?
4. (Original post by Jimmy20002012)
L

Hey how do you know when partial internalreflection occurs?

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It always does. Partial means little/half.
5. (Original post by Jimmy20002012)
L

Hey how do you know when partial internalreflection occurs?

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when the angle of incidence is equal to the critical angle
6. (Original post by StalkeR47)
Sorry, I just ate my crappy chicken wraps. I am very confident for the exam. Just had ICT exam today. And, sorry, I have never posted anything on the biology section chemistry section. But yeah, maths physics a lot of times.
Awh, I thought you were looking forward to them xD
How did ICT go? :')
Oh right, must just be Physics then! That's weird :L
7. [QUOTE=Jimmy20002012;42964251]L

Hey how do you know when partial internalreflection occurs?

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Partial internal reflection always occurs at a boundary when the angle of incidence is less than or equal to the critical angle.
8. That's chemistry done now for this one - my last exam.

They certainly saved the best til' last *heavy sarcasm intended*
when the angle of incidence is equal to the critical angle
Equal or less than the critical angle.
10. (Original post by x-Sophie-x)
Awh, I thought you were looking forward to them xD
How did ICT go? :')
Oh right, must just be Physics then! That's weird :L
HI! I was looking forward to them but found out that they were crap. HAHA. ICT was a doddle.
11. (Original post by StalkeR47)
Equal or less than the critical angle.
But when we have to draw the light path on a diagram, you only do both if the angle of incidence is equal to the critical angle - that's all we're expected to know for the exam (I think).
12. (Original post by StalkeR47)
HI! I was looking forward to them but found out that they were crap. HAHA. ICT was a doddle.
Haa :L
That's good xD
Can't say any of my exams were 'a doddle' haha.
But when we have to draw the light path on a diagram, you only do both if the angle of incidence is equal to the critical angle - that's all we're expected to know for the exam (I think).
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.
14. Can someone show me how to draw Jan 2011, 3E pleasee
15. (Original post by x-Sophie-x)
Haa :L
That's good xD
Can't say any of my exams were 'a doddle' haha.
My sociology exam was definitely a flow. I had that exam on the same day as maths so I focused 99.9999% on c1 c2 and 0.00001% on sociology. HA. I failed it. Definitely.
16. (Original post by h94k)
Can someone show me how to draw Jan 2011, 3E pleasee
Draw a rectangular screen. And on it, draw a fringe pattern. Make sure middle one is more bright and label min max. etc.
when the angle of incidence is equal to the critical angle
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?
18. (Original post by h94k)
Can someone show me how to draw Jan 2011, 3E pleasee
like this! The bottom spectrum.
19. (Original post by StalkeR47)
Draw a rectangular screen. And on it, draw a fringe pattern. Make sure middle one is more bright and label min max. etc.
Are there different colours?
20. (Original post by StalkeR47)
My sociology exam was definitely a flow. I had that exam on the same day as maths so I focused 99.9999% on c1 c2 and 0.00001% on sociology. HA. I failed it. Definitely.
I'm not the only one then >.<

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