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  1. S

    A2 Physics | Post your doubts here

    One lamp was used to create photoelectric emission. Another lamp was just used to increase the light to make it easier to see and observe the experiment. You need to show that the second lamp used for observation had a frequency less than that of the threshold frequency calculated by the work...
  2. S

    A2 Physics | Post your doubts here

  3. S

    A2 Physics | Post your doubts here

    Exactly! you need to push and exert a force to compress a gas! Therefore you have to make some work to compress it i.e work is +ve!
  4. S

    A2 Physics | Post your doubts here

    please repost the subject of the statement. thank you!
  5. S

    A2 Physics | Post your doubts here

    How is the anode in an x-ray tube held at earth potential when electrons are accelerated through a voltage?
  6. S

    A2 Physics | Post your doubts here

    No need to argue with ms at this point :D But when the wire cuts the flux, this means that there is a change in flux. The rate of change of flux will determine the magnitude of the emf. If the question asked why does the e.m.f change polarity and vary, then you can answer that the rate of change...
  7. S

    A2 Physics | Post your doubts here

    Look at how many modulated carrier waves there are between the period of the signal. One wave of the signal is represented by 10 waves of the carrier. yup , it is, cz you assume all energy goes into the water when it may go to the kettle or the atmosphere.
  8. S

    A2 Physics | Post your doubts here

    I thought the kinetic energy does remain constant during a phase change, cz k.e is proportional to temperature change?
  9. S

    A2 Physics | Post your doubts here

    Definitely helped, Thank you for the clarification! Jazakum allahu khairan!
  10. S

    A2 Physics | Post your doubts here

    link plz? I know that, but I mean I cant differentiate between them on the graph!
  11. S

    A2 Physics | Post your doubts here

    From the application booklet, "There is a continuous distribution of wavelengths with a sharp cut-off at short wavelength and also a series of high-intensity spikes that are characteristic of the target material." I dont get the difference between the "sharp cut-offs" and the "high intensity...
  12. S

    A2 Physics | Post your doubts here

    the signal is a sine wave, so it has is like one wave.. which has a min and a max, which will cause a region of high frequency when its a maximum and a region of low frequency when its a min. Hence at 12 us frquency is min i.e a trough on the signal wave, at 4 us , frequency is min i.e trough on...
  13. S

    A2 Physics | Post your doubts here

    oh , how can I top that salam. Then Ill just say the same :) wa-alykumessalam warahmatullah wabaraktuh!
  14. S

    A2 Physics | Post your doubts here

    Now now, lets not get dramatical :p Im not hurt :D Uhmm I have an endorsed Cambridge book, by David Sang , graham jones, richard woodside and gurinder chadha.
  15. S

    A2 Physics | Post your doubts here

    :( Excuse me, I never knew about support booklets... :cry: Sorry... Are there any more though? :D
  16. S

    A2 Physics | Post your doubts here

    I think this is the new one? http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_Applications_Booklet_WEB.pdf Updated October 2009!
  17. S

    A2 Physics | Post your doubts here

    May you share the link for more? Wow man, thank you for sharing! This is pretty cool!
  18. S

    A2 Physics | Post your doubts here

    Photoelectric effect is the process where electrons are emitted from a cold metal surface when electromagnetic radiation of sufficient frequency falls on it. It is used to show the particulate nature of particles / electrons...
  19. S

    A2 Physics | Post your doubts here

    to provide coverage at the poles!
  20. S

    A2 Physics | Post your doubts here

    question was asking for 5 minutes!
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