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  1. H

    A2 Physics | Post your doubts here

    wenever u see mean power use rms value
  2. H

    A2 Physics | Post your doubts here

    no charge stored capaciotor plates store equal charge of opposite signs so no overall charge.............and energy is stored since there is a charge separation.....to separate charges like this work must have been done
  3. H

    A2 Physics | Post your doubts here

    well u completely mis unnnderstood it....volume=nRT/P we knw every thing bt not n.......so we know how man alpha particles given out per second.....so we cn calculate how many given out in 40 days.......and since every alpha particle becomes helium atom....use this number....divide it by...
  4. H

    A2 Physics | Post your doubts here

    well no need to knw the derivcation of eq...1/3 *density*c^2
  5. H

    A2 Physics | Post your doubts here

    well as for bandwidth....we only need to knw its meaning....i.e rangew of frequencies that are amplified by the sam amount....or over which gain is constant
  6. H

    A2 Physics | Post your doubts here

    change in k.e is equal to change in internal energy for ideal gas....ain't it?
  7. H

    A2 Physics | Post your doubts here

    no they are 90 degree out of phase......only current and flux are in phase
  8. H

    A2 Physics | Post your doubts here

    well k i used pTIMES DELTA V......and got the anser......bt oe doubt...as we knw internal energy of ideal gas is 3/2 PV,,.....why it cnt be used here.....cnt undrstnd why it gives the rong ansa'...
  9. H

    A2 Physics | Post your doubts here

    well for q7 b http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w09_qp_41.pdf
  10. H

    A2 Physics | Post your doubts here

    brother u are correct ....emf in primary coil and emf in secondary are 180 degree out of phase........the question asked about current and emf in secondary coil which is ov corass 90 degree out of phase
  11. H

    A2 Physics | Post your doubts here

    because force is experienced along the whole circumference of the wire
  12. H

    A2 Biology | Post your doubts here

    well cn u tell examples of interaction of genotype with environment
  13. H

    A2 Physics | Post your doubts here

    practice question LAST PART TOUGH ONE !!!
  14. H

    A2 Physics | Post your doubts here

    well in derving work done = p delta v....we assumed the gas expanding or contracting against constant external pressure....chek chapter 4 chriss mee book for frther clarification
  15. H

    A2 Physics | Post your doubts here

    well in fm......why bandwidth is higher?......is it because frequencies in order of megahertz are used rather than khz as in am......secondly...book mentions bandwidth is 200khz....so max signal frequency cn be 15khz.....now i dint get this......plus do greater sound frequencies imply better...
  16. H

    A2 Physics | Post your doubts here

    well heat loss is not same ...its the power loss that is same ....so use Pt instead of HEAT LOOSS IS same
  17. H

    A2 Physics | Post your doubts here

    well why we used two different power ratings......to make allowance for heat losses.......so assume that Ploss is same in both cases.....now set up 2 simultaneous eq. and solve
  18. H

    A2 Physics | Post your doubts here

    well.....m not sure....bt i belive that with coaxial cables and wire pairs u have signal in form of current...(an electrical signal)so u need to complete the circuit thats why there's return for the signal whereas optic fibre ahs signal in form of pulse of light....not changing CURRENT or P.D so...
  19. H

    A2 Physics | Post your doubts here

    name the two mechanism that cause attenuation in wire pairs? The changing currents in the wires themselves produce electromagnetic (EM) fields and this makes the wires act as aerials, radiating EM waves. The energy to emit these waves reduces the strength of the signal sent along the wire. As...
  20. H

    A2 Physics | Post your doubts here

    Where is the return pathway for the signal in fibre optic cables? Another cable?[/quote no idea....bt one point on bandwidth,,.....coaxial cable has higher bandwidth cos it has electromagnetic sheilding.....changing currents inside cables produce em waves which radiate energy......so as...
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