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  1. E

    Physics: Post your doubts here!

    You can get most of the answers to the questions at this blog http://physics-ref.blogspot.com/2014/05/physics-9702-notes-worked-solutions-for.html
  2. E

    Physics: Post your doubts here!

    For the practical, make sure you standardize all of the sig fig for the measurements and calculations that you do. For example, you are plotting a graph of resistance against length. The resistance is from the resistors that you alter. The sig fig for these values don't matter because you aren't...
  3. E

    Physics: Post your doubts here!

    Ok, i finally get what your asking about. Sorry about that. I think there's no 0 intensity because the speakers are connected to an ac power supply. In an ac circuit, the current changes direction. http://www.answers.com/Q/Is_a_speaker_usually_driven_with_AC_or_DC_current
  4. E

    Physics: Post your doubts here!

    https://www.google.com/search?q=young's+double+slit+experiment&rlz=1C1KMZB_enMY614MY614&tbm=isch&tbo=u&source=univ&sa=X&ei=xKVQVd-KF6SwmAWLoYDoDg&ved=0CDAQsAQ&biw=1241&bih=584#imgrc=mdwZhBYE58VwmM%253A%3BhZqAo6hjXQTxXM%3Bhttp%253A%252F%252Fcnx.org%252Fresources%252Fdc45f72de39c65b1e7f2cf1a0ec1459...
  5. E

    Physics: Post your doubts here!

    Im not sure about the point sources but the way i look at is that the middle of XY will have the highest intensity(highest peak) because its a zero order. Then as you go further from the middle, lets say to the first order the intensity gradually decreases. The 2 speakers are coherent sources...
  6. E

    Physics: Post your doubts here!

    No. When you increase the width of the slit, you are increasing the intensity of the light. So the results will be that the bright fringes are brighter, no change to the dark fringe and no change to fringe separation. If there are lesser bright fringes then the fringe separation would change.
  7. E

    Physics: Post your doubts here!

    no change to fringe separation
  8. E

    Physics: Post your doubts here!

    1.The question says that the car is travelling with speed v for 29.3m. When the brakes are applied, the car produces skid marks and during this time the deceleration is 0.85g. Basically, you can split the distance into 2 parts. The first part would be the 29.3m in which the car is travelling at...
  9. E

    Physics: Post your doubts here!

    6) b) i) Just outline the ripple tank experiment. You can either draw the ripple tank or describe it. For the diffraction of the water waves, just simply state that you put 2 wooden blocks in the ripple tank with a small gap between them to create diffracted waves. Also state the method to...
  10. E

    Physics: Post your doubts here!

    Young modulus is the gradient for the graph of stress against strain. Normally, when we measure the Young Modulus we take it from the proportional limit, that is the straight line part of the graph. This straight line part denotes the max load for which hooke's law is obeyed and is also the...
  11. E

    Physics: Post your doubts here!

    Because at the breaking force, the extension is no longer proportional to the force applied, that is hooke's law is no longer obeyed.
  12. E

    Physics: Post your doubts here!

    Weight - F=ma (2.3*9.81) - (0.042* 12^2)= 2.3(a) 23-6.048=2.3(a) a=7.4 ms^-2 Basically the weight of the object is pulling it downwards while the friction is acting upwards. If the weight is more than the friction then you get an acceleration. Hope you get it!
  13. E

    Physics: Post your doubts here!

    Because the density of the air varies. As you go up the mountain, the air gets thinner meaning the no. of air molecules decreases. For pressure, the air molecules collide with one another as well as with the wall of the container. When they collide they experience a change in momentum which in...
  14. E

    Physics: Post your doubts here!

    Try to ask your lecturer to let you in for at least 1 lesson. Other than that, there's not much you can do for the practical. Just make sure to read the instructions carefully and don't waste marks unnecessarily on careless mistakes like significant figures. Really watch your significant...
  15. E

    Physics: Post your doubts here!

    Well, my advice is to do really well for your AS exam. Aim for the paper 3(practical). And its actually not impossible to score less than 10 wrongs for the paper 1 & 2. (Totally possible!) Just practice more and remember that physics is about application not memorizing.
  16. E

    Physics: Post your doubts here!

    I would assume less than 10 marks lost for each paper.
  17. E

    Physics: Post your doubts here!

    Question 6 part iv Why is it a straight line through the middle :O how??? please explain! http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-7.html. They explain in detail here. Hope you see the light!
  18. E

    Physics: Post your doubts here!

    Can anyone explain the following question 4 c) to me? How do we know that the system is the ball and the plate? Why not just the ball? http://theallpapers.com/papers/CIE/AS_and_ALevel/Physics%20(9702)/9702_s04_qp_2.pdf
  19. E

    Physics: Post your doubts here!

    Resistance is the reciprocal of the gradient For W-X, the graph is a straight line, this means that both pd and current are constant, hence resistance is constant For X-Y to Y-Z, the gradient is increasing, hence, resistance is increasing.
  20. E

    Physics: Post your doubts here!

    For 7 b) ii) 1. mass energy is conserved because the difference in mass is released is energy namely gamma radiation or kinetic energy. Einsteins equation= e= mc^2 To put it simply, take the helium atom. To make a helium atom you would have to combine 2 protons and 2 neutrons. If you were to...
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