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  1. Y

    Physics, Chemistry and Biology: Post your doubts here!

    No they aren't similar. The OR doesn't have that circle in it.
  2. Y

    Physics, Chemistry and Biology: Post your doubts here!

    The ray should strike Q and then move to the other end of the optical fibre. There should not be any more reflections. And: You will get 1 mark only if you made one more reflection and the lower surface. But you get 0 marks if there is more than 2 reflections.
  3. Y

    Physics Guide

    Notes and past papers are definitely enough.
  4. Y

    How to find the direction of Alpha and Beta particles?

    See you are shown with the magnetic field direction and the electron direction. Use your left hand rule respectively, you will get the force direction. Then reverse it because electron movement is different from the conventional current.
  5. Y

    Physics paper 3

    Hey I got a question. http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Physics%20(0625)/0625_w11_qp_31.pdf In question 7 b) I got the answer as 1.94 x 108 m/s but in the mark scheme it is 1.948 x 108 m/s Is that okay?
  6. Y

    Physics Guide

    Actually for magnets they always ask either the AC Motor or DC Motor. Methods to increase the current or such stuff. And transformer questions, electromagnetic induction. It is very important to know that in a transformer, the coil makes a changing magnetic field that gets cut and then an...
  7. Y

    Physics Guide

    To be honest, General Physics, Waves, Heat and temperature, CRO, Logic gates, Electronic components are enough from here. Magnets and electrcity, I recommend doing past papers.
  8. Y

    Physics, Chemistry and Biology: Post your doubts here!

    That is correct, but in physics answers are never that simple. The speed increases for what? To reduce friction and resistance.
  9. Y

    Physics, Chemistry and Biology: Post your doubts here!

    Thanks.
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