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Recent content by hellodjfos;s'ff

  1. hellodjfos;s'ff

    Physics: Post your doubts here!

    Look over mark schemes for question 2's last part and also just read the ECR for P3 - example candidate responses.
  2. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Unlikely that they will go below 227 for those that gave AS and A2 separately and not below 229 for those that gave AS and A2 together.
  3. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Yeah yeah I remember, I wrote 1.30.
  4. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Thank you for refreshing my memory. Yes it was 1.3(i mean that's what I got).
  5. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    I am so exhausted that I remember very few answers. Usually I'll remember all the answers but this exam has drained the life out of me. 1. Coefficient was 6 maybe(don't remember properly) 2. Log question: x=0.126 - don't remember properly 5. Complex number roots question: k=2 7. Refer for m16...
  6. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Yeah how was it? Fine paper but not enough time. Still did well enough to get an A* - best case scenario would be 71, worst case scenario would be 68 so I'll lose 5-6 marks I'm guessing. Forgot about the constant in differential equation so one mark lost there, didn't attempt the expand...
  7. hellodjfos;s'ff

    Physics: Post your doubts here!

    What? Mean time would be 9.4s but with an uncertainty of 0.4s. Mean period would be 0.47 with an uncertainty of 0.02s. Oh we can't use the multiplied or divided rule in this because the calculations only involved one variable that had one uncertainty. So we had to use max-min values/2 - really...
  8. hellodjfos;s'ff

    Physics: Post your doubts here!

    Variant 2
  9. hellodjfos;s'ff

    Physics: Post your doubts here!

    It varied depending on the values of t for example one set of values were 9.0 and 9.8s. Here the period would be 9.4/20 but the uncertainty would be ( (9.8/20)-9/20)/2 - basically the max and min value method of finding uncertainty: max value-min value/2
  10. hellodjfos;s'ff

    Physics: Post your doubts here!

    Oh yeah alright. Didn't read the question properly. Yeah Io would be the intensity of wave with no reflection so in that case you would place the microphone really close to speaker and facing it and measure the intensity.
  11. hellodjfos;s'ff

    Physics: Post your doubts here!

    Yes we would use the relation for intensity and amplitude(intensity is directly proportional to amplitude squared). You need not explain how to calculate k(intensity in terms of k should be fine). Yes the microphone will be placed besides the speaker but in a side-view diagram, that is...
  12. hellodjfos;s'ff

    Physics: Post your doubts here!

    Loudspeaker connected to signal generator and microphone connected to CRO placed infront of the wall. That's about it. Did a free hand drawing so hopefully you get an idea of what it looks like.
  13. hellodjfos;s'ff

    Physics: Post your doubts here!

    Large closed container with a beaker containing salt and water solution(placed on a tripod with a fire gauge and bunsen burner beneath it), the large closed container will be connected to a vacuum and a pressure gauge will be placed in the container for pressure readings.
  14. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    They had given space above the box and whisker plots to do working to find median and the quartiles so you should have shown some sort of working that would give you a mark or two.
  15. hellodjfos;s'ff

    Mathematics: Post your doubts here!

    Yes not arranged. That question is the only one I have got wrong so far in maths alevel exams. Probably gonna cost me my distinction...
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