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

    7
    ReputationRep:
    (Original post by Gunner121)
    Doppler effect ??? Someone please explain
    http://www.youtube.com/watch?v=Tn35SB1_NYI

    learn that definition.
    Offline

    2
    ReputationRep:
    For june 2011 question 11 I think it is (the one where you have to work out the resistance) for the last one I thought the total of the two resistors in series is 2R and then so 1/2R + 1/R = 3/2R but what's wrong, what am I doing wrong?
    Offline

    0
    ReputationRep:
    (Original post by ArcRaman)
    BBB - blue bends better
    RBR - red bends rotten.

    Therefore you can see that if blue and red light travel in the same media, other than vacuum, blue light will always have to experience a greater index of refraction.
    So shorter wavelengths refract more?

    Posted from TSR Mobile
    Offline

    0
    ReputationRep:
    (Original post by Tomupcraft)
    http://www.youtube.com/watch?v=Tn35SB1_NYI

    learn that definition.
    That was nice !
    Offline

    11
    ReputationRep:
    Jan 11 q11c) - how are you supposed to know to where to mark the compressions on Z? I feel like I'm missing something really obvious but I just can't see it!Name:  phys jan 11.png
Views: 85
Size:  55.8 KBName:  phys jan 11 ms.png
Views: 69
Size:  51.5 KB
    Offline

    2
    ReputationRep:
    Jan 11 can somebody please explain qu. 19?
    Offline

    11
    ReputationRep:
    (Original post by Gunner121)
    Doppler effect ??? Someone please explain
    Use brightstorm2 channel in YouTube it is excellent!
    Offline

    7
    ReputationRep:
    (Original post by ambbs)
    Jan 11 q11c) - how are you supposed to know to where to mark the compressions on Z? I feel like I'm missing something really obvious but I just can't see it!Name:  phys jan 11.png
Views: 85
Size:  55.8 KBName:  phys jan 11 ms.png
Views: 69
Size:  51.5 KB
    One time period is between adjacent compressions. If the wave had traveled T the positions would basically look the same, the particles would have just moved up the line. However as 3/4T has passed then the compressions must be 3/4 along the line between two compressions.

    If that does not make sense I will try to explain further.
    Offline

    11
    ReputationRep:
    (Original post by Tomupcraft)
    One time period is between adjacent compressions. If the wave had traveled T the positions would basically look the same, the particles would have just moved up the line. However as 3/4T has passed then the compressions must be 3/4 along the line between two compressions.

    If that does not make sense I will try to explain further.
    Ah okay so if 1/2T had passed, the compressions would be halfway along the line between two compressions, i.e., at a rarefaction? Thanks!
    Offline

    7
    ReputationRep:
    (Original post by ambbs)
    Ah okay so if 1/2T had passed, the compressions would be halfway along the line between two compressions, i.e., at a rarefaction? Thanks!
    Yes, that is correct.
    Offline

    0
    ReputationRep:
    Name:  phyy.png
Views: 78
Size:  44.4 KB How to solve this question? The answer is 'D'. Anyone please.
    Offline

    0
    ReputationRep:
    (Original post by Tomupcraft)
    Yes, that is correct.
    Could you explain, so the larger the wavelength the more it refracts and bends away from the normal in a denser medium ?

    Posted from TSR Mobile
    Offline

    7
    ReputationRep:
    (Original post by AT95)
    Name:  phyy.png
Views: 78
Size:  44.4 KB How to solve this question? The answer is 'D'. Anyone please.
    I have explained this on the previous page
    Offline

    0
    ReputationRep:
    (Original post by alygirl)
    Jan 11 can somebody please explain qu. 19?
    I hope you get it
    Name:  IMG_0290.jpg
Views: 83
Size:  506.6 KB
    Name:  IMG_0290.jpg
Views: 83
Size:  506.6 KB
    Offline

    2
    ReputationRep:
    How do you label something out of phase? I'm thinking of question 12 Jan 09
    Offline

    7
    ReputationRep:
    (Original post by Branny101)
    Could you explain, so the larger the wavelength the more it refracts and bends away from the normal in a denser medium ?

    Posted from TSR Mobile
    No, The smaller the wavelength, hence greater the frequency the more the wave refracts.
    therefore if we take red and blue light, blue light will refract greater towards the normal than red light.

    Diffraction is the opposite, the greater the wavelength the greater the diffraction.
    Offline

    0
    ReputationRep:
    (Original post by alygirl)
    Jan 11 can somebody please explain qu. 19?
    Here is the second one :

    Name:  IMG_0291.jpg
Views: 57
Size:  518.8 KB
    Offline

    7
    ReputationRep:
    (Original post by alygirl)
    How do you label something out of phase? I'm thinking of question 12 Jan 09
    Do you mean out of phase or 180 degrees out of phase? out of phase can be anything that is not in phase with a point, wheres a point in anti phase must be 180 degrees out of phase.
    Offline

    0
    ReputationRep:
    (Original post by krisshP)
    Use brightstorm2 channel in YouTube it is excellent!
    Okay
    Offline

    0
    ReputationRep:
    (Original post by Gunner121)
    Okay
    (Original post by Tomupcraft)
    Do you mean out of phase or 180 degrees out of phase? out of phase can be anything that is not in phase with a point, wheres a point in anti phase must be 180 degrees out of phase.
    (Original post by Branny101)
    Could you explain, so the larger the wavelength the more it refracts and bends away from the normal in a denser medium ?

    Posted from TSR Mobile
    Could anyone explain, please?

    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
    Has a teacher ever helped you cheat?
  • 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.