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# The Physics PHYA2 thread! 5th June 2013 watch

• View Poll Results: What mark do you think you got out of 70?
0-20
6
3.00%
21-40
12
6.00%
41-50
29
14.50%
51-60
79
39.50%
61-70
74
37.00%

1. (Original post by masryboy94)
well then lets hope for any easy 4 marker in the exam !!!
Fingers crossed! its my last exam, cant wait to finish it.
2. well thats not very nice whoever negged me, its like you want a hard question hahaha !
3. (Original post by StalkeR47)
You can say, streamlined reduces air resistance.
Thanks, I hate questions like those. I prefer the maths bit any day
4. i think the 6 marker to describe to measure wavelength of a laser light or to define differences and similarities between interference and diffraction grating
5. (Original post by Nav_Mallhi)
Fingers crossed! its my last exam, cant wait to finish it.
ahhh lucky AS students !! im starting my exams from tomorrow, got 6 CRAZY exams
6. (Original post by Claree)
That makes sense, but how does that answer the question? Is it not the fact that the plane is affected by air resistance, rather than what features of the plane affect air resistance, that limits the maximum horizontal velocity?
You will have to think about what factors of the (PLANE) contribute to it's speed. There are many, eg, streamlines, speed/acceleration etc. It can be the wind and other factors that affect the plane's velocity. So, you can use both.
7. (Original post by masryboy94)
ahhh lucky AS students !! im starting my exams from tomorrow, got 6 CRAZY exams
I guess, but, I hate 2 exams in one day... Thursday I've got COMP2 and Mech1 ;__;
8. (Original post by masryboy94)
ahhh lucky AS students !! im starting my exams from tomorrow, got 6 CRAZY exams
I've got 3 left, and can you show us how to derive the 2nd equation we have to know?
9. (Original post by masryboy94)
well thats not very nice whoever negged me, its like you want a hard question hahaha !
Why did you get 3 down in fact 4 down votes? What is going on? You are helping others.
10. Can anyone explain Question 7b in January 2011, please?
11. (Original post by Raimonduo)
I guess, but, I hate 2 exams in one day... Thursday I've got COMP2 and Mech1 ;__;
What exam board? My Mechanics is on Monday
12. (Original post by masryboy94)
ahhh lucky AS students !! im starting my exams from tomorrow, got 6 CRAZY exams
13. (Original post by StalkeR47)
Why did you get 3 down in fact 4 down votes? What is going on? You are helping others.
got no idea
14. (Original post by x-Sophie-x)
Can anyone explain Question 7b in January 2011, please?
Why not Sophie? You will get TIR so just draw the same ray but TIR ray. Does that make sense? If not, I will post a diagram for you.
15. (Original post by sceezy)
question 7bii on june 2012 ?
okay, you're told that both those waves are moving towards the left

P would move up, because left of P is a peak. As whole wave moves to the right, the peak will go through point P, forcing it upwards

wave B is a longitudinal wave, instead of moving up and down (like in wave A), the particles will move left and right along the same line as where the wave is moving. Q will shift to the left, because an area of compression is left of Q. So as the wave continues moving along to the right, that area of compression will pass through point Q, pulling it leftwards
16. What's the rule for refraction? Does it refract closer tot he normal if it goes into a lower refractive index or more?
17. Could someone please explain to me why, in the Jan 2013 paper - question 7bi, they used the speed of light when the question clearly states that they are microwaves?
18. (Original post by BajoLily)
Could someone please explain to me why, in the Jan 2013 paper - question 7bi, they used the speed of light when the question clearly states that they are microwaves?
Speed of microwaves is the speed of light. Microwaves are electromagnetic waves, just like visible light. All EM waves have the same speed.
19. Can someone explain to me when partial internal reflection happens? As in, on most of the questions you'd draw a refracted ray and that was it, full marks. But on just ONE of the questions one of the marks you get is for partial internal reflection?
20. (Original post by BajoLily)
Could someone please explain to me why, in the Jan 2013 paper - question 7bi, they used the speed of light when the question clearly states that they are microwaves?
The question said that it is in a vacuum. All waves travel at the speed of light in vacuums

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