Join TSR now and get all your revision questions answeredSign up now

The Physics PHYA2 thread! 5th June 2013 Watch

  • View Poll Results: What mark do you think you got out of 70?
    0-20
    6
    3.02%
    21-40
    11
    5.53%
    41-50
    29
    14.57%
    51-60
    79
    39.70%
    61-70
    74
    37.19%

    Offline

    0
    ReputationRep:
    (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?
    Offline

    2
    ReputationRep:
    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?


    Posted from TSR Mobile
    Offline

    0
    ReputationRep:
    Does anyone need any help?
    Offline

    0
    ReputationRep:
    (Original post by Jimmy20002012)
    L

    Hey how do you know when partial internalreflection occurs?


    Posted from TSR Mobile
    It always does. Partial means little/half.
    Offline

    1
    ReputationRep:
    (Original post by Jimmy20002012)
    L

    Hey how do you know when partial internalreflection occurs?


    Posted from TSR Mobile
    when the angle of incidence is equal to the critical angle
    Offline

    2
    ReputationRep:
    (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
    Offline

    0
    ReputationRep:
    [QUOTE=Jimmy20002012;42964251]L

    Hey how do you know when partial internalreflection occurs?


    Posted from TSR Mobile[/QUOTE
    Partial internal reflection always occurs at a boundary when the angle of incidence is less than or equal to the critical angle.
    Offline

    2
    ReputationRep:
    That's chemistry done now for this one - my last exam.

    They certainly saved the best til' last *heavy sarcasm intended*
    Offline

    0
    ReputationRep:
    (Original post by BigBadJFly)
    when the angle of incidence is equal to the critical angle
    Equal or less than the critical angle.
    Offline

    0
    ReputationRep:
    (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.
    Offline

    1
    ReputationRep:
    (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).
    Offline

    2
    ReputationRep:
    (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.
    Offline

    0
    ReputationRep:
    (Original post by BigBadJFly)
    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.
    Offline

    0
    ReputationRep:
    Can someone show me how to draw Jan 2011, 3E pleasee
    Offline

    0
    ReputationRep:
    (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.
    Offline

    0
    ReputationRep:
    (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.
    Offline

    13
    ReputationRep:
    (Original post by BigBadJFly)
    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?
    Offline

    0
    ReputationRep:
    (Original post by h94k)
    Can someone show me how to draw Jan 2011, 3E pleasee
    like this! The bottom spectrum.
    Offline

    0
    ReputationRep:
    (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?
    Offline

    2
    ReputationRep:
    (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 >.<



    Could anybody help me structure an answer to this please?

    "Describe the necessary procedure in order to obtain an accurate and reliable value for the wavelength of the laser light. Your answer should include details of all the measurements and necessary calculations"
 
 
 
Poll
Which pet is the best?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.