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“Our greatest glory is not in 'never falling', but in rising, every time we fall. ..." -...
“Our greatest glory is not in 'never falling', but in rising, every time we fall. ..." - Theodore Roosevelt- Aarjit
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heelp on registrating for SAT 1 exam
I see ample views here, it's just unfortunate that you didn't get any insightful replies. You should remind yourself that registration isn't as seamless as signing up for the XtremePapers Community, rather, it can be quite extensive and confusing when the ask you to make your student profile...- Aarjit
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- Forum: SAT / IELTS / TOEFL
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TO DO: 1. Measurement tech.[for 52] 2. Forces [torque,couples,momentum] 3. Deformation [graphs]...
TO DO: 1. Measurement tech.[for 52] 2. Forces [torque,couples,momentum] 3. Deformation [graphs] 4. Waves [problems] 5. Electricity [laws]- Aarjit
- Profile post
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your avatar needs a positively-skewed Bohr shift! ;)
your avatar needs a positively-skewed Bohr shift! ;)- Aarjit
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A level Biology: Post your doubts here!
True, but molecules such as H20 (very polar) and CO2 (though it has nil overall polarity) are small enough and CAN RAPIDLY PASS/diffuse through the bilayer, down the potential/pressure gradient. It's only the LARGE polar molecules such as glucose, amino acids and ions which cannot diffuse... -
great forums, r? Make the most out of 'em. :)
great forums, r? Make the most out of 'em. :)- Aarjit
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Mathematics: Post your doubts here!
Well, this was how I'd solved it before: Simply 'choose' 2 Gs out of 3, and the remaining 7 letters can be completely random! G G _ _ _ _ _ _ _...............[consider GG to be 'attached' together so that it can alternate in 2! ways] n = 2! x 3c2 x 7!.................. [but don't forget... -
Mathematics: Post your doubts here!
Agreed. Got carried away.. Statistics overdose! ;) -
Mathematics: Post your doubts here!
That's for checking whether you can possibly transform a binomial distribution to a normal distribution. If A ~ B (n,p) then A ~ N (np, npq); where np > 5 and nq > 5 -
Mathematics: Post your doubts here!
[Q6] The probability that Sue completes a Sudoku puzzle correctly is 0.75. (i) Sue attempts n Sudoku puzzles. Find the least value of n for which the probability that she completes all n puzzles correctly is less than 0.06. [3] S ~ B(n,0.75) .....P(S = n) < 0.06 or, nCn 0.75^n... -
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Mathematics: Post your doubts here!
[Q4] (iii) Find the number of different selections of 4 letters from the 9 letters of the word HAPPINESS which contain no Ps and either one or two Ss. Discard all the Ps and keep the Ss aside: H A P P I N E S S H A I N E ........... S S 1st Criteria: 1S no Ps S _ _ _ ......... [Note... -
Chemistry: Post your doubts here!
Good questions. Allow me to answer them in bullets: Photons can come from electron transitions or almost any source of LIGHT; Electrons absorb the energy from photons and get promoted to discrete higher energy levels (this is also referred to as adsorption, but wanted to keep the rudiments... -
Chemistry: Post your doubts here!
I know.. but we have to learn it in quantum physics too [continuos and line spectra]. This will give you a rough estimate: V I B G Y O R 400 - 700 nm -
Chemistry: Post your doubts here!
Exactly! C's absorption peak is ~ 450 - 500 nm which corresponds to RED*. *You need to infer this from the emission spectrum, not from the table. It's best if you memorize the colors and their corresponding frequencies. -
Chemistry: Post your doubts here!
Try to understand that the wavelength of the light absorbed is not equal to the wavelength of the light emitted. [i.e. if yellow light (600 nm) is absorbed, the same yellow light is not emitted! A light with the corresponding wavelength in the ABSORPTION SPECTRUM ~ blue is emitted] Here, this... -
Chemistry: Post your doubts here!
On adding heavy water (D2O), peaks (Eg. -OH) disappear because the deuterium nucleus has a nuclear spin of +/- 1 rather than +/- .5, so it does not absorb the same frequency range as H1. See how the -OH is removed from ethanol after adding heavy water: CH3CH2OH + D2O <---> CH3CH2OD + HOD -
Chemistry: Post your doubts here!
The splitting of the absorption peaks (n) depends upon the # adjacent hydrogen atoms (h). n = (h +1) peaks -
Chemistry: Post your doubts here!
(i) The absorption peak (D) is ~ 650 nm which corresponds to the color (emitted) having a wavelength of 450 nm, i.e. blue. If the peak were to be shifted towards 700 nm, you would see a much darker (violet) solution. (ii) Apply E = h.f =h. (c/λ) [Since E is inversely proportional to λ, the...