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  1. A

    AS PHY PRACTICAL 33

    Yes, but apart from that, your 'reading' is actually a measurement in the sense that 0 has error +-.005 and any mark,say 20.0, has the same error. So reading in 20.0 is +-.01.. I hope this cleared your confusion :)
  2. A

    AS PHY PRACTICAL 33

    calculated value is a measurement. so you multiply .005 by 2 to get .01
  3. A

    Physics: Post your doubts here!

    Thanks a million :))
  4. A

    Physics practical tips

    The one you've posted.. both are correct as far as I think, but your method is better. :)
  5. A

    Physics practical tips

    Help needed ASAP 1. On taking average, do we divide the uncertainty by 2? Cz thats what they've done in several marking schemes but there are some in which they've doubled the error. Like, 2 values have an uncertainty of .1 each. What is the uncertainty in their average value? .1 or .2? 2. If we...
  6. A

    Physics practical tips

    You are right about this one... Not so sure if you'll get bombed.. :p
  7. A

    Physics: Post your doubts here!

    But ive come across several marking schemes in which they take the uncertainty of the averaged value as .2.. but at the same time there are many others in which they take it as .1.. pretty confused.. :/
  8. A

    Physics: Post your doubts here!

    For P3, the part on percentage uncertainty troubles me alot.. If we measure two values, each with uncertainty .1cm, and calculate their average, would the absolute error in the calculated value be .2 or .1? Also, if the diameter of a tube has an uncertainty of .1cm, what would be the uncertainty...
  9. A

    Physics: Post your doubts here!

    Yes you are right.. go for 3sf if thats the case. Since calculated values must have the same no./one more no. of sf as compare to that of raw data.. :)
  10. A

    Chemistry: Post your doubts here!

    Any tips for P3??
  11. A

    Physics: Post your doubts here!

    You're right, but they wont deduct your marks.. late reply, i know, but this might clear your confusion for P3 :)
  12. A

    Physics: Post your doubts here!

    You are to judge them by the no. of sig fig in the least count of the raw data (apart from any constants) no. of sf can either by equal to or one more than those of a value having the least no of sf in a calculation
  13. A

    Physics: Post your doubts here!

    For Q3d(i) and (ii) use v= u + at.... You should get the answer.. Q6(b) draw every point on the wave at the same position with respect to y-axis... but 20cm (.25 of wavelength) before the original position
  14. A

    Physics: Post your doubts here!

    For part i draw a line joining another set of points of intersection (preferably the one right next to line X so that its easier for me to explain part ii) For part ii, draw a line exactly halfway b/w line X and the line for part i... Since destructive interference occurs in b/w two constructive...
  15. A

    Physics: Post your doubts here!

    In Youngs double slit experiment, decreasing the light intensity on on of t he slits decreases the contrast b/w light and dark fringes. Does increasing the light intensity have the same effect?
  16. A

    Chemistry: Post your doubts here!

    Two questions: Q1. We write 'white fumes' as an observation if HCl is formed. Do we write the same thing for HBr and HI? Q2. In reactions b/w PCl3 and alcohols/carboxylic acids heat is required, but not for those b/w them and PI3. Is this correct? Also, does any one have Quick revision notes for...
  17. A

    Chemistry: Post your doubts here!

    Does the solubility of group2 metal hydroxides increase or decrease down the group?
  18. A

    Chemistry: Post your doubts here!

    I think it makes a covalent bond stronger. And it makes a covalent compound more reactive..
  19. A

    A level Biology: Post your doubts here!

    Isnt sucrose water soluble? :/ Ive read that all sugars are water soluble..
  20. A

    A level Biology: Post your doubts here!

    Extremely stupid of me to ask such a question 10 days before the exam, but... why is glucose converted to sucrose for translocation? Just because its not as reactive?? :/
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