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Edexcel Unit 2: Physics at Work ~9th June 2014 watch

  • View Poll Results: How did you find the Unit 2 physics exam (Edexcel- A level 9th June 2014) ?
    GCE- Very difficult
    3
    2.00%
    GCE- Quite difficult
    6
    4.00%
    GCE- Medium
    44
    29.33%
    GCE- Quite easy
    52
    34.67%
    GCE- Very easy
    18
    12.00%
    IAL- Very difficult
    4
    2.67%
    IAL- Quite difficult
    9
    6.00%
    IAL- Medium
    7
    4.67%
    IAL- Quite easy
    2
    1.33%
    IAL- Very easy
    5
    3.33%

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    I've created this thread for the Unit 2 exam, as there doesn't seem to be a thread on it. Feel free to discuss anything regarding this exam, such as how you are revising if you have already started. :cool:
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    (Original post by BP_Tranquility)
    I've created this thread for the Unit 2 exam, as there doesn't seem to be a thread on it. Feel free to discuss anything regarding this exam, such as how you are revising if you have already started. :cool:
    I have done this paper last year
    Good luck to you all
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    Do you know if we need to know the frequencies/wavelengths for the EM spectrum?
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    (Original post by BP_Tranquility)
    Do you know if we need to know the frequencies/wavelengths for the EM spectrum?
    Yes you do, last year a question came up albeit 1 mark but it came up, "What does this frequency belong too?" also the wavelengths are necessary as they usually ask questions on colour wavelengths such as blue and red.
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    (Original post by zachariou1)
    Yes you do, last year a question came up albeit 1 mark but it came up, "What does this frequency belong too?" also the wavelengths are necessary as they usually ask questions on colour wavelengths such as blue and red.
    Oh, I didn't know that thanks .When revising for GCSEs, I would go through the specification and use it as a checklist, but the Edexcel physics spec doesn't seem to be as specific (and vague in some areas), so do you know of any online checklist/resource I could use instead?
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    (Original post by BP_Tranquility)
    Oh, I didn't know that thanks .When revising for GCSEs, I would go through the specification and use it as a checklist, but the Edexcel physics spec doesn't seem to be as specific (and vague in some areas), so do you know of any online checklist/resource I could use instead?
    I agree completely, but sadly I don't know anywhere to get a more in depth spec.
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    lets get revising!! im going to post questions from the edexcel papers on here. best explanations will get reeeeeepppppppp.
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    Name:  2014-04-14_194952.png
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Size:  25.8 KBshow your working out in the form of a spoiler. best (or first answer for calculation questions) answer gets reppppp.
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    (Original post by sabphysics)
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    Spoiler:
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    The wave is in phase so the path difference equals n times lambda (whole number of wavelengths). A whole cycle would be 2pi radians so pi/2 divided 2pi gives 1/4 so the answer is D (1/4 lambda)..?

    Good idea btw
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    (Original post by BP_Tranquility)
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    The wave is in phase so the path difference equals n times lambda (whole number of wavelengths). A whole cycle would be 2pi radians so pi/2 divided 2pi gives 1/4 so the answer is D (1/4 lambda)..?

    Good idea btw
    that is correct!
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    Can anyone explain stopping potential to me please?
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    (Original post by Monica96)
    Can anyone explain stopping potential to me please?
    Stopping potential is the potential difference that just stops all emitted electrons - it allows the maximum kinetic energy of the photoelectrons to be calculated.
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    (Original post by sabphysics)
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    This is where using \tau instead of \pi to measure radians would be better. Then you could very easily convert between phase and path difference by swapping \tau and \lambda.

    Unfortunately, chance has it we are stuck with \pi.
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    (Original post by pinkgorilla)
    Stopping potential is the potential difference that just stops all emitted electrons - it allows the maximum kinetic energy of the photoelectrons to be calculated.
    Thank you Are there any important experiments we should know about stopping potential?
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    (Original post by Monica96)
    Thank you Are there any important experiments we should know about stopping potential?
    I'm not too sure, but I would advice just being aware of the whole photocell experiment and how it works.
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    (Original post by pinkgorilla)
    I'm not too sure, but I would advice just being aware of the whole photocell experiment and how it works.
    OK thanks. I dislike 6 mark experiment questions
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    (Original post by pinkgorilla)
    I'm not too sure, but I would advice just being aware of the whole photocell experiment and how it works.
    do you mean the photoelectric effect?
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    (Original post by sabphysics)
    do you mean the photoelectric effect?
    Basically, yes.
 
 
 
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