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  1. H

    A2 Physics | Post your doubts here

    well i have some doubts in communication chapter.........what has bandwidth to do with quality cos i always thought it has to do with the transmission capacity....if u have got high bandwidth u cn transmit more information.....bt books and ms says fm has greater bandwidth so greater...
  2. H

    A2 Physics | Post your doubts here

    chadha's book
  3. H

    A2 Physics | Post your doubts here

    well it will burn up in the atmosphere due to great friction at such high speeds......i remeber this from last year when one of satellite was on verge of colliding bt waas torn to pieces due to huge air resistanceee
  4. H

    A2 Physics | Post your doubts here

    helpful Two consecutive peaks in an ultrasound A-scan are separated by a time interval of 0.034 ms. Calculate the distance between the two reflecting surfaces. (Assume that the speed of sound in the tissue between the two surfaces is 1540ms-I.) Explain why ultrasound cannot readily be used to...
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    A2 Physics | Post your doubts here

    The ultrasound image clearly shows the baby's skin and some bones. Explain why these show up clearly while softer organs inside its body do not.
  6. H

    A2 Physics | Post your doubts here

    when e ver u see mean power....use RMS values
  7. H

    A2 Physics | Post your doubts here

    SUUGEST WHY ULTRASOUND CANT BE USED TO EXAMINE BONES ultrasound isn't used to image bones. you get plenty of reflection of the ultrasound energy at the tissue/bone interface, but very little transmission into the bone. That means there's little to no sound energy reflecting back from any...
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    A2 Physics | Post your doubts here

    Suggest why a patient may be asked to hold his or her breath during a CAT sean.
  9. H

    A2 Physics | Post your doubts here

    hoow limiting aperture size improves sharpness and how backing photgraphic film with flourescent material improves contrast
  10. H

    A2 Biology | Post your doubts here

    Suggest an advantage of having photosystems, the electron transport chain and ATP synthase as part of the thylakoid membrane? i find bio papers quite tough bt GT ARE high compared to phy and chem which seems more easy.........do u guys also find bio papers hard(esp markingschemes) one important...
  11. H

    A2 Physics | Post your doubts here

    well why newtons law apply to planets even though they r nt point masses......ms says radius much smaller than separation.........i dint unerstand this....wen performing calculations we are taking distance between centres of two planets.......isnt it?
  12. H

    A2 Physics | Post your doubts here

    then dude just memorise the markschemes.......its also much easier to understand from there rather than taking the pain to read from booklet
  13. H

    A2 Physics | Post your doubts here

    for 2 b iii u know mass of ice melted in 10 min.....from this u cn find the mass of ice melted in 5 min just due to atmosphere....now subtract this value from 64.7 and apply Q=mLf
  14. H

    A2 Physics | Post your doubts here

    well thermocuple has a very small heat capacity as its temp. sensing probe is small so its very quick to respond and doesn't significantly alters the temp. of object being measured by absorbing heat......thermistor thermometer is very much sensitive bt over a short range.......thermocouple can...
  15. H

    A2 Physics | Post your doubts here

    well car suspensions system are critcally damped to bring the car to equilibrium position in the shortest possible time without setting up oscillation which otherwise cud make it difficult to control the car
  16. H

    ***WARNING***

    no problem dude.....from last two exam sessions nothing has happened
  17. H

    A2 Biology | Post your doubts here

    well....guyxxx.......m worried beacuse of time duration for exam....what do u think....is two hours enuf....especially when u have lots of suggest questions
  18. H

    A2 Biology | Post your doubts here

    well dna contains all the genes so we ll have to cut the gene using restriction enzymes.....that wud be a very difficult task.....frthermore if we cut the gene..........the mRNA made from it Normally undergoes post transcriptional modification in which introns are spliced out....this cnt be done...
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    A2 Physics | Post your doubts here

    i have posted solution ....chek on previous thread
  20. H

    Mathematics: Post your doubts here!

    welll theres a much easier and quick way wherevery u see radicals as here........just take square on both sides ....then employ either logarithmic differentiation or implicit differentiation.....its going to make the algebra hell easier
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