Search results

  1. N

    Negative quantum states

    can somebody simply explain what is meant by NEGATIVE QUANTUM STATES , as given by dirac in his theory???i know its not as SIMPLE as i want it to be , but still I would like to know its significance in the most basic way!!
  2. N

    Magnetic monopoles?

    magnetic monopoles?? why dont magnetic monopoles exist??
  3. N

    Pseudo forces

    Why are pseudo forces also sometimes called INERTIAL FORCES , even though their need arises because of non inertial frames??:confused:
  4. N

    Stoichiometry problem help

    Homework Statement A neutral gas sample contains 84% ( by volume ) of CH4 , 10 % of C2H6 , 3 % of C3H8 and 3% of N2 . If a series of catalytic reacns cud be used for converting all the C atoms of the gas into butadiene , C4H6 , with 100% efficiency , how much butadiene cud be prepared frm 100...
  5. N

    Circular orbits help

    Homework Statement Two satellites of the Earth move in a common plane along circular orbits , the radii being r and r-\Deltar ( \Deltar << r ). What is the time interval b/w their periodic approaches to each other over the min. distance . Take M to be the mass of the earth M = 6 * 10 24 kg ...
  6. N

    Optical isomerism

    Homework Statement is this compound chiral??why or why not?? http://img827.imageshack.us/i/gmp.png/ Homework Equations The Attempt at a Solution i dont think it is.........what do u think??
  7. N

    Optical isomerism

    Homework Statement A sample of synthetic camphor contains both the d and l isomers in unequal amounts . The specific rotation of the sample is found to be -13.9 degrees . What is the enantiomeric excess of the sample? (A) 0.215 (B) 0.314 (C) 0.417 (D) 0.167 plzz xplain ur...
  8. N

    Complex nos.

    Homework Statement Let alpha = e ^ i8pi / 11 , then find Re ( alpha + alpha ^2 + alpha ^3 + alpha ^4 + alpha ^5). Homework Equations The Attempt at a Solution look i hav reduced the expression to \alpha (\alpha^5 -1 ) / \alpha-1 now what to do??:confused:
  9. N

    Min value

    Homework Statement If a , b ,c r distinct +ve integers such that ab + bc + ca is greater than equal to 107 , then find the minimum value of 1/6 ( a^3 + b^3 + c^3 - 3abc ) Homework Equations The Attempt at a Solution tried usin AM GM equality but i m confused which nos. shud i use??
  10. N

    FIITJEE OPEN TEST question

    FIITJEE OPEN TEST question.... Homework Statement A mechanism with 2 sliders is shown in the fig. Slider A at the instant shown has a speed of 3 m/sec and is accelerating at the rate of 15 m/s^2 towards rite at the given instant . If rod AB has a length of 3m and \theta is 60 degree at the...
  11. N

    Complex nos.

    Homework Statement let z , w be complex nos. such that z + i ( conjugate of w ) = 0 and zw = pi . Then find arg z.. Homework Equations The Attempt at a Solution well i m unable to understand wat is meant by zw=pi...
  12. N

    Carboxylic acids

    Homework Statement what is the product A?? http://img266.imageshack.us/i/43982323.png/ Homework Equations The Attempt at a Solution i can only think of decarboxylation , which is wrong?? wat else can happen??
  13. N

    Phenyl and methyl shift

    why is phenyl shift better than methyl shift?
  14. N

    Complex nos.

    Homework Statement what is the relation between complex slopes of two perpendicular lines?? :think: Homework Equations The Attempt at a Solution i think it is same as the slopes of two st. lines that is the product shud be -1........but the answer given is sum of slopes is...
  15. N

    Convert ethyl alcohol to vinyl acetate

    Homework Statement Convert ethyl alcohol to vinyl acetate ( in not more than 6 steps).. Homework Equations The Attempt at a Solution this is wat i tried: first added conc. H2SO4 at 120 degrees , ethene is formed , then added Br2 in CCl4 , 1 2 dibromoethane is obtained .....then...
Top