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  1. H

    A2 Physics | Post your doubts here

    Describe how you would demonstrate the photoelectric effect. Include a diagram of the apparatus........cud come cos electron diffraction and lenzs law has come already by the way is stopping potentail in syllabus
  2. H

    A2 Physics | Post your doubts here

    i asked across diode!!!
  3. H

    A2 Physics | Post your doubts here

    Explanation of the characteristic X-ray spectra Electrons accelerated by the high voltage can reach sufficient energies that when they collide with the atoms of the target, they can knock out one of the inner shell electrons. When an electron in an upper state drops down to fill the vacated...
  4. H

    A2 Physics | Post your doubts here

    cn smone draw rectified p.d across diode for half wave rrectification
  5. H

    A2 Physics | Post your doubts here

    thats singapore a level question
  6. H

    A2 Physics | Post your doubts here

  7. H

    A2 Physics | Post your doubts here

    a practice question....
  8. H

    A2 Physics | Post your doubts here

    well Steps to obtain emission line spectrum: Gases such as hydrogen or neon are placed in an discharge tube at low pressure. A high voltage of several kilo-volts is applied across the cathode and anode of the discharge tube. The gas atoms become excited by the collision with the electrons...
  9. H

    A2 Physics | Post your doubts here

    helpful
  10. H

    A2 Physics | Post your doubts here

    well wud it be varying like -ve half of sine wave or not?
  11. H

    A2 Physics | Post your doubts here

    well in half wave rectification......during the half in which diode is reverse biased,,,,,,how the potential varies acroos diode? , gettimg cnfused in this ....tell me the concept
  12. H

    A 2 Physics HELP !!! (TIPS, EXAM TYPICAL QUESTIONS AND DISCUSSION)

    INTERNAL ENERGY:It is the sum of a random distribution [1] of kinetic and potential energies [1] associated with the molecules of a system. Why is the specific latent heat of fusion of any substance always less than its specific latent heat of vaporization? As a solid melts into a liquid, its...
  13. H

    A2 Physics | Post your doubts here

    suggest why alchol and mercury thermometers give different readings at the same temp?
  14. H

    A 2 Physics HELP !!! (TIPS, EXAM TYPICAL QUESTIONS AND DISCUSSION)

    For accurate readings, thermometer must be much smaller than the system, so that the energy the thermometer gains or loses doesn’t significantly alter the energy content of the system.
  15. H

    A2 Physics | Post your doubts here

    thanks brother....t.here was one question in which i cnsidered it to be heavy bt ms said light....bt now understtodd that heavy means no oscillation will occur after force is applied
  16. H

    A2 Physics | Post your doubts here

    its that e.m.f is -ve d(phi)/dt
  17. H

    A in A2 physics !

    well waht is stopping potential? iitss not in our course ....neva saw a question on this
  18. H

    A2 Physics | Post your doubts here

    well it does DEPEND on distance travelled by the light ray cos energy is lost due to scattering and absorption in the glass......its glass inside ...optic fibre is not hollow
  19. H

    A2 Biology | Post your doubts here

    bioleaching can be done in situ>>what does it mean? ooh i got it.....weel somebody myt find this useful http://wiki.biomine.skelleftea.se/wiki/index.php/In-situ_leaching
  20. H

    A2 Physics | Post your doubts here

    signal to noise ratio represent the number of times the signal power must be larger than noise power in order to distinguish between signal or noise ....if this ratio becomes tooo low signal is lost into the noise
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