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  1. S

    A2 Physics | Post your doubts here

    For the rectification graphs, which year was it? And the question asked for the voltage across diodes right? Please refer back where "user" [ thoroughly interpreted the problem with lots of diagrams ]
  2. S

    A2 Physics | Post your doubts here

    D1 is there to avoid any output current from the op amp when the op amp output is at a negative voltage. If the op amp has no negative voltage power supply, then there will be no need for D1. D2 is there to prevent a high voltage, generated by the coil when power is removed, from damaging the...
  3. S

    A2 Physics | Post your doubts here

    Question June 2002 6 a) I am having problems with the first part of the graph! Please upload a picture of it, and I will reply whether I agree or not!
  4. S

    A2 Physics | Post your doubts here

    If the emission seems to be constant, then the half life is very long. The number given in the question is rate of emission i.e delta N / delta t, which I think is the activity.
  5. S

    A2 Physics | Post your doubts here

    Hmm im not sure I agree, cz electrons have a particele nature. It is the electrons which have the wave-particle dualty.
  6. S

    A2 Physics | Post your doubts here

    half life is way too long.
  7. S

    A2 Physics | Post your doubts here

    to find the speed of one of them only.
  8. S

    A2 Physics | Post your doubts here

    yes, because delta u is the increase in internal energy. Negative increase is a decrease!
  9. S

    A2 Physics | Post your doubts here

    please mention the syllabus point which states, learning bandwidth of op-amp.
  10. S

    A2 Physics | Post your doubts here

    my advice to you, please do memorize at least frequencies. wavelengths can be found by v = lambda x frequency "(l) Candidates should be able to recall the frequencies and wavelengths used in different channels of communication. " you mean paper 5? I didnt even look at it -_- .. do we have to...
  11. S

    A2 Physics | Post your doubts here

    thats quite an over-exaggeration dont you think?:confused: Most of my doubts were answered over here... Lots of people helped me. I still have alot of unanswered doubts. Plus, im only taking physics, so I had a whole month to study, and I still have lots of confusions! true, thats the correct...
  12. S

    A2 Physics | Post your doubts here

    its better to write the answer as 8000 times rather than 8kHz. because hz is number of time per second, while the question is asking for the number of times only. Please avoid losing unnecessary marks ! ;)
  13. S

    A2 Physics | Post your doubts here

    yup! hydrogen nuclei or "protons" :) Thank you for the concern, brother :)
  14. S

    A2 Physics | Post your doubts here

    The application booklet is the best source there is. Because its prepared by examiners. Its only 43 pages. 10 pages per hour, you will be done withh all chapter of applications today! Any problems you got please do post them or inbox me!
  15. S

    A2 Physics | Post your doubts here

    If you arre the poles, this means that you are on the centre of rotation. For example, if you rotate around your self, you are on the axis of rotation. What is your centripetal force? its zero because centripetal force is M x R ( from centre ) x omega square. Since R is zero, the force is zero...
  16. S

    A2 Physics | Post your doubts here

    that is correct, but I kind of have a similar problem if you notice Nov 09 P 42 Q 2 cii) But when it asks for work done, just use P x delta V. as for the other part, im not sure. P.S:- your diode graphs you showed were incorrect for full wave rectification.
  17. S

    A2 Physics | Post your doubts here

    yay! But pleaase do help me crack Nov 09 P42 Question 2 c ii) I cant seem to figure out why this question was omitted. Plus Im confused of which way to solve it. By charle's law, volume increase hence temperature increases. But by first law of thermodynamics , work is done by gas hence internal...
  18. S

    A2 Physics | Post your doubts here

    Was thinking about it to, still didnt get to it, but what I think is that since the electric field lines of SIMILAR charges are in opposite directions, then the sum of electric field strengths has to be zero at some point which is show on the graph. But if they are opposite charges, the electric...
  19. S

    A2 Physics | Post your doubts here

    then why is insufficient information quoted in the marking scheme? what is not there? Question is :- I used the same formula, but what IF i used work done = P x Delta V = n x R x Delta T The formula we are using is P x Delta V = - work done = decrease in internal energy = decrease in k.e = 3/2...
  20. S

    A2 Physics | Post your doubts here

    I thank you for your reply, but you have not addressed my question. I believe you will if you tell me whats wrong with c ii)
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