Hey there! Sign in to join this conversationNew here? Join for free

Edexcel Physics Unit 2 "Physics at work" June 2013 Watch

  • View Poll Results: The last question - Does resistance increase or decrease?
    It increases ( using V=IR or some other method)
    70.73%
    It decreases using the 'lattice vibrations' theory
    29.27%

    Offline

    2
    ReputationRep:
    (Original post by gideonv)
    Hi guys Did anyone get the same answer as me for the 4.3ev resonant frequency question? I did......... E=hf. 4.3x 1.6 x10^-19=6.63x10^-34f so when rearranging this, f=1 x10^15
    I got that!
    Offline

    5
    ReputationRep:
    MCQ answers:

    Let me know if you disagree.

    1)D
    2)D
    3)D
    4)B (as said by others)
    5) no question
    6)C
    7)B
    8)A
    9)A
    10)A
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by ALevel96)
    MCQ answers:

    Let me know if you disagree.

    1)D
    2)D
    3)D
    4)B (as said by others)
    5) no question
    6)C
    7)B
    8)A
    9)A
    10)A
    is question 7 about the wire with length l and the answers were in terms of drift velocity?
    i remember getting v/2 .. i think it was B ?
    Offline

    5
    ReputationRep:
    7 is the radiation flux question
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by ALevel96)
    7 is the radiation flux question
    Do you have the list of questions and their answers? if so then i'd greatly appreciate it if you post the list?
    Offline

    11
    ReputationRep:
    (Original post by Alexsk)
    Guys isn't 57-60 very high for an A? The answer was V/2, and has nothing to do with charge carriers. Also, can somebody give a definition to critical angle? For the question about wavelength I did not write about troughs or peaks and just said its the distance travelled by a wave for a complete oscillation to take place. Is that correct?
    Critical angle is the angle of incidence at which angle of refraction=90*, so light travels along medium boundary.
    Offline

    3
    ReputationRep:
    (Original post by x0x)
    Do you have the list of questions and their answers? if so then i'd greatly appreciate it if you post the list?
    Someone kindly posted them here. https://www.dropbox.com/sh/v6ydqbfrg...R-r9ZOSH?lst#/
    As for the answers I guess we just work them out ourselves
    Offline

    11
    ReputationRep:
    (Original post by x0x)
    Do you have the list of questions and their answers? if so then i'd greatly appreciate it if you post the list?
    https://www.dropbox.com/sh/v6ydqbfrg...ZWR-r9ZOSH?lst

    Another user posted ^
    Offline

    10
    ReputationRep:
    (Original post by hamzeh h)
    im thinking 58-59
    Way too high. 54 or 56 max.


    Posted from TSR Mobile
    Offline

    10
    ReputationRep:
    (Original post by ALevel96)
    MCQ answers:

    Let me know if you disagree.

    1)D
    2)D
    3)D
    4)B (as said by others)
    5) no question
    6)C
    7)B
    8)A
    9)A
    10)A
    I disagree with 10, I got D. But either could be correct. Your thoughts?


    Posted from TSR Mobile
    Offline

    3
    ReputationRep:
    For question 4 wouldn't it be 2v?
    Because v=I/nq2A because the area is doubled. Bring the 2 over and be 2v? Or am I completely wrong?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by x0x)
    is question 7 about the wire with length l and the answers were in terms of drift velocity?
    i remember getting v/2 .. i think it was B ?
    Yes! all of my MC answers match yours
    i forgot what question 5 was :P
    Offline

    0
    ReputationRep:
    I wrote that 3 is C. Is that wrong?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by B-Stacks)
    For question 4 wouldn't it be 2v?
    Because v=I/nq2A because the area is doubled. Bring the 2 over and be 2v? Or am I completely wrong?
    You need to consider two equations here
    Resistivity and the drift velocity equation
    from the resistivity one you can tell that nothing changes as l and A are both doubled so they cancel out. That means that I is constant as R is unchanged
    then you use I=nAvq . A is doubled but there is no l so it has to be v/2
    I don't think i explained it well at all but i think v/2 is the answer. If anyone can explain this better please do so
    Offline

    3
    ReputationRep:
    (Original post by Alexsk)
    I wrote that 3 is C. Is that wrong?
    If you look at where the waves finish you will see that Y is ahead of X.
    Offline

    5
    ReputationRep:
    (Original post by Jaydude)
    I disagree with 10, I got D. But either could be correct. Your thoughts?


    Posted from TSR Mobile
    Superposition produces an interference pattern
    Offline

    5
    ReputationRep:
    5 was the Doppler question and I think I chose C
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by ALevel96)
    5 was the Doppler question and I think I chose C
    so S was moving towards O and O was moving towards s?
    is that choice C? i that is the one i have chosen
    Offline

    11
    ReputationRep:
    (Original post by Alexsk)
    I wrote that 3 is C. Is that wrong?
    I put C too. I think we're right, because I remembered seeing this in the textbook Name:  ImageUploadedByStudent Room1370514521.634454.jpg
Views: 308
Size:  28.6 KBName:  ImageUploadedByStudent Room1370514527.631827.jpg
Views: 299
Size:  41.0 KB


    Posted from TSR Mobile
    Offline

    0
    ReputationRep:
    Did anyone see through the trick question in question 17? It wasn't a negative gradient graph, because that's when the voltmeter is measuring the load resistance, but in this question the voltmeter was measuring the Pd at the battery, so it would've been a positive graph


    Posted from TSR Mobile
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Brexit voters: Do you stand by your vote?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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

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