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AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread] Watch

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    (Original post by Mehrdad jafari)
    Just how likely you think it is


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    How likely do I think it is?
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    (Original post by gcsestuff)
    Someone ask me some turning point questions


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    ether, a hypothetical medium once thought to necessary to support the propagation of electromagnetic waves throughout space, cannot explain why a light shone towards a detector on a moving train traveling in the same direction as the incident light takes the same amount of time to reach the detector as if the train was stationary. Explain why



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    (Original post by ubisoft)
    How likely do I think it is?
    Yeah, but i didn't ask you a question


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    (Original post by Mehrdad jafari)
    Yeah, but i didn't ask you a question


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    I did
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    (Original post by ubisoft)
    I did
    Lol, yeah, but you asked yourself not me


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    (Original post by Mehrdad jafari)
    Lol, yeah, but you asked yourself not me


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    I asked you how likely do you think that I think it is?
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    (Original post by ubisoft)
    I asked you how likely do you think that I think it is?
    It really depends on how well you the content. Also you need to be very familiar with exam papers and techniques. But what i simply meant was that if you think it is possible then it's possible. You should be so confident that you shouldn't be asking this


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    (Original post by Mehrdad jafari)
    It really depends on how well you the content. Also you need to be very familiar with exam papers and techniques. But what i simply meant was that if you think it is possible then it's possible. You should be so confident that you shouldn't be asking this


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    Lol well, I haven't read the book or done a single paper yet. Let's see how it goes
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    (Original post by ubisoft)
    Lol well, I haven't read the book or done a single paper yet. Let's see how it goes
    Neither have i. Just have confidence and don't stress out, that's it


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    (Original post by Mehrdad jafari)
    Neither have i. Just have confidence and don't stress out, that's it


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    I did, but I kind of lost it today after FP2. Don't think I'll get my firm offer, so losing motivation a bit.
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    Is the decay constant the same of same isotopes? and does it stay the same during decay?
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    (Original post by ubisoft)
    I did, but I kind of lost it today after FP2. Don't think I'll get my firm offer, so losing motivation a bit.
    I do understand you man. It's a very intense moment when you think you are loosing something. But trust me you can still compensate. Also if your interview went well then there is also a chance that you will be accepted even if you think you don't get the place. But you don't want to perform well because you hold an offer, do you? Just stay focused and realise that it's just a moment that makes a difference


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    (Original post by ubisoft)
    Is the decay constant the same of same isotopes? and does it stay the same during decay?
    No because some isotopes are more likely to decay than others so they will have a greater decay constant. Decay constant is the same throughout the decay process, it's the activity that's decreasing as time goes by because the number of nucleus remaining to decay decreases, if that helps


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    (Original post by Mehrdad jafari)
    No because some isotopes are more likely to decay than others so they will have a greater decay constant. Decay constant is the same throughout the decay process, it's the activity that's decreasing as time goes by because the number of nucleus remaining to decay decreases, if that helps


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    Yeah but I said same isotopes? All same isotopes have same decay constant?
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    (Original post by ubisoft)
    Yeah but I said same isotopes? All same isotopes have same decay constant?
    I wouldn't think so, that's why they are isotopes. For example uranium in power stations is a unique isotope of uranium( forgot the Ar) because it has a greater decay constant if I'm not mistaken


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    How do I solve these sorts of questions? Name:  image.jpg
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    What is the criteria for deciding whether a lens will be the eyepiece or objective on a refracting telescope?
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    Is magnification Beta / Alpha ?

    Also is it only mirrors that suffer from spherical abberation??
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    (Original post by Fvthoms)
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    What is the criteria for deciding whether a lens will be the eyepiece or objective on a refracting telescope?
    Is this the one where the lens is like 40cm or something? (I think I remember doing this question)

    If so it would be the objective lens. In refracting telescopes the focal length of the eyepiece lens is only about 2cm. If it was 40cm, the focal length of the refracting telescopes objective lens would have to be huge to have such a big eyepiece lens focus length. And we know that refracting telescopes are not great when they're large, the get too heavy and awkward to move, the lenses distort etc.

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    (Original post by CD223)
    Because that's the temperature that the mould decreases to, from its initial temperature of 327 degrees.


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    How do you know that? It says the molten lead starts at 327 and the iron finishes at 84. I don't understand why you can deduce that the final temperature is therefore 327-84? It's probably really basic just don't see it
 
 
 
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