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Thread: Physics Exam Thoughts

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    Physics Exam Thoughts

    I personally found it much easier than previous years.
    How about you guys?
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    Re: Physics Exam Thoughts

    Based on the syllabus changes, I was expecting a challenging and conceptual paper but instead got a steaming turd.
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    Re: Physics Exam Thoughts

    Found the short answer alright, but the mc hard
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    Re: Physics Exam Thoughts

    I also found it easier, band 6 cut off will defininately be higher. What did u guys write for the reason that projectile motion experiment was invalid? I honestly had no clue what to write so I just said that you can’t measure the horizontal displacement coz the starting position is not from the ground and this would affect the result. Would I get any marks for that?

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    Re: Physics Exam Thoughts

    i also was expecting a challenging paper, while i found this test pretty easy. Some of the mc where difficult but that's about it.

    The projectile motion question was invalid because the ruler was closer to the screen then the ball, meaning perspective would skew the actual horizontal distance of the ball.

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    Re: Physics Exam Thoughts

    Quote Originally Posted by Robrules3 View Post
    I also found it easier, band 6 cut off will defininately be higher. What did u guys write for the reason that projectile motion experiment was invalid? I honestly had no clue what to write so I just said that you can’t measure the horizontal displacement coz the starting position is not from the ground and this would affect the result. Would I get any marks for that?
    I think it's cause he's only got a ruler for the horizontal and not the vertical.
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    Re: Physics Exam Thoughts

    what graph did everyone draw for the spinning magnet inducing emf? (3 marker)

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    Re: Physics Exam Thoughts

    did anyone know how to do the 6 marker on transmission lines and houses? I found that one really hard

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    Re: Physics Exam Thoughts

    Quote Originally Posted by Stev3n View Post
    what graph did everyone draw for the spinning magnet inducing emf? (3 marker)
    It's a normal emf curve except the amplitude and frequency is increasing
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    Re: Physics Exam Thoughts

    Sin or cos graph?

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    Re: Physics Exam Thoughts

    Quote Originally Posted by Stev3n View Post
    Sin or cos graph?
    It starts from stationary so probably sine
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    Re: Physics Exam Thoughts

    initially the magnet wasn't moving so i would think sin

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    Re: Physics Exam Thoughts

    Damn, I forgot increasing frequency

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    Re: Physics Exam Thoughts

    Quote Originally Posted by Stev3n View Post
    what graph did everyone draw for the spinning magnet inducing emf? (3 marker)
    For that curve I had increasing amplitude and decreasing period every half-rotation since velocity was increasing

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    Re: Physics Exam Thoughts

    Quote Originally Posted by Powereaper View Post
    For that curve I had increasing amplitude and decreasing period every half-rotation since velocity was increasing
    Ah be careful. Period is the time it takes to complete one rotation. Since velocity is increasing this time will be less
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    Re: Physics Exam Thoughts

    What did people do for Wilson's cloud chamber for Y? I put gamma, cause the tracks were not zig-zag

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    Re: Physics Exam Thoughts

    I found the mcq very hard- probably list 4+ marks lol.

    For Q2Q, what was source X and Y?? I was gonna put alpha radiation for both but it specifically states that they are different types of radiation, so I put:
    X as beta
    - shorter half life
    and Y as alpha
    - longer half life

    I have no idea if that's correct :/

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    Re: Physics Exam Thoughts

    Does anyone know how many marks the question about the impacts of scientific knowledge and development of technology on use of semiconductors was

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    Re: Physics Exam Thoughts

    Quote Originally Posted by Powereaper View Post
    What did people do for Wilson's cloud chamber for Y? I put gamma, cause the tracks were not zig-zag
    If I remember correctly, X was the first, short one and Y was the second, longer one, but anyway maybe it was gamma... but both tracks were straight like a standard alpha path
    Last edited by Exp; 1 Nov 2018 at 1:43 PM. Reason: horrible english :/

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    Re: Physics Exam Thoughts

    Quote Originally Posted by sohail747 View Post
    Does anyone know how many marks the question about the impacts of scientific knowledge and development of technology on use of semiconductors was
    4

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    Re: Physics Exam Thoughts

    Quote Originally Posted by Exp View Post
    I found the mcq very hard- probably list 4+ marks lol.

    For Q2Q, what was source X and Y?? I was gonna put alpha radiation for both but it specifically states that they are different types of radiation, so I put:
    X as beta
    - shorter half life
    and Y as alpha
    - longer half life

    I have no idea if that's correct :/
    X was alpha because they produce short and thick tracks(hence why it was in bold)
    Y was beta as they produce long and thin tracks.
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    Re: Physics Exam Thoughts

    Ok MC sucked
    But I expected short answer to be way harder
    Option (Quanta) was the best.




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    Re: Physics Exam Thoughts

    Quote Originally Posted by Drdusk View Post
    X was alpha because they produce short and thick tracks(hence why it was in bold)
    Y was beta as they produce long and thin tracks.
    but doesn't the cloud chamber rely on the degree of ionisation, and so alpha would have the longest path since highest ionisation as opposed to beta?

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    Re: Physics Exam Thoughts

    Quote Originally Posted by Exp View Post
    but doesn't the cloud chamber rely on the degree of ionisation, and so alpha would have the longest path since highest ionisation as opposed to beta?
    It relies on the particle ionizing the water vapor around it. Alpha particles are really highly ionizing hence they don't make it much past where they're generated(hence their path is short).

    Beta particles are much less ionizing and hence similarly their paths are long
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    Re: Physics Exam Thoughts

    Am i the only one that didnt find the exam as easy as everyone is making it out to be? Did medical physics option btw

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