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  1. H

    A2 Biology | Post your doubts here

    wwell cn somebody tell em what happens in sympatric speciation.........>??? and i cant get the idea of forming hybrid between two inbred lines.......why are they genetically identical??(is it because the all have parents with same genetic makeup).....what is the purpose of inbreeding ........why...
  2. H

    A2 Biology | Post your doubts here

    explain the role of natural selection in EVOLUTION? ms mentions that individuals can potentially overproduce but do not do so cos most die b4 reaching maturity due to disease hunting etc......so as a result population size remains roughly constant.....now WTH has this to do with evolution
  3. H

    A2 Physics | Post your doubts here

    WELL for the last row.....if ice is less dense than water this means that in water molecule wud be closer compared to the that in ice......and so P.E has decreased and thus U shud decrease.....bt ms says it increased.........and also ice has larger volume than that water according to info...
  4. H

    A2 Physics | Post your doubts here

    one disadvantage of using ac current ms says cables require greater insulation.....but whyyy?
  5. H

    A2 Physics | Post your doubts here

    well in this question Explain the main principles behind the generation of ultrasound to obtain diagnostic information about internal body structures. there is a put crystal cut to give resonance.....whereas it shud be like this that alternating p.d of frequency equal to natural frequency of...
  6. H

    A2 Physics | Post your doubts here

    well cehk http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_w09_qp_42.pdf Q no. 9 .....Va Vb and Vc are kind of different channels of multichannel cable......prolly there lll be many such channels each carrying either 0 or a 1 this what i...
  7. H

    A2 Physics | Post your doubts here

    thats wat it shud look like roughly..... by the way in the last part of this question shudnt the amplitude be smaller also
  8. H

    A2 Physics | Post your doubts here

    i cant understand the ms point that for wave enrgy cn be continuosly collected so emission shud occur at all frequencies.....the cnfusion is that in case of photon also energy is being collected as it is converted into thermal enrgy if below threshold.....so wats the difference?
  9. H

    A2 Physics | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s09_qp_4.pdf question3.....finding latent heat of vaporisation......why we are taking the heat lost at both power ratings same....shudnt it be different like it shud be more for 70WATT power rating
  10. H

    A2 Physics | Post your doubts here

    yeaaa??????
  11. H

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w09_qp_41.pdf q 3 b (ii) i cnt undrstnd ms.....smbody explain please
  12. H

    Chemistry: Post your doubts here!

    well.....there are 0.001 moles of naoh and .0025 moles of acid. now naoh will react with acid and the resulting solution contains .001 mole salt and .0015 mole unreacted acid.now finnd their conc with the total volume now being 20cm^3 and now simply apply the henderson-hasselbalch equation
  13. H

    A2 Physics | Post your doubts here

    wat u mean
  14. H

    Physics: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s03_qp_4.pdf 5 d ii ...cn u tell where ,ark shud be.....shud it ne on the bottom line of square
  15. H

    A2 Physics | Post your doubts here

    flux will graph wwill be in phase with current in primary coil graph...........wats the cnfusion here?
  16. H

    A2 Physics | Post your doubts here

    One condition for a satellite to be in geostationary orbit is that the orbit of the satellite must lie in the plane containing the equator. Explain why this is necessary?
  17. H

    A2 Physics | Post your doubts here

    there is a problem wid dis explanation cos net force shud be the centripetal force.......(cos centripetal force is not a force on its own)it shud be like Fg-N=Fc........so Fg-Fc=N ......And N=mg where g is the acceleration of free falll........wat do u say
  18. H

    A2 Physics | Post your doubts here

    i hope u find this useful plus why is UHF USED?in mobile phone signals ms . short aerial so easy to handle short range so less interference between base stations larger waveband so more carrier frequencies cn smbody explain the last point
  19. H

    A2 Physics | Post your doubts here

    yea anybody got an idea on why a multichannel cable needed,,,,
  20. H

    A2 Physics | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w03_qp_4.pdf q1 part c
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