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Chemistry: Post your doubts here!
If you notice, this thread is about chemistry doubts. :p Only the 'Mendeleev ka bacha' will ask doubts now. :p -
Chemistry: Post your doubts here!
Can this thread be locked and thrown away now that all the Chemistry exams are over? ^_^ Thanks. -
Physics: Post your doubts here!
You shouldn't. It's the same formula. Cross-section area of the wire = πr² or π(d/2)² ---> π d²/2² ---> πd/4 We're not halving the uncertainty because we shouldn't! Think of how an uncertainty occurs when you're measuring the diameter. It is because of the markings in the ruler. You're... -
Physics: Post your doubts here!
The mark scheme is incorrect. Put in the values in the range formula, and you don't get your original question. range = [v^2 * sin2(theta)]/g You get 4.98 m when you put in the values from the answers when it's really supposed to be 40 m. -
Physics: Post your doubts here!
I've redrawn the circuit to make it easier to apply Kirchoff's law. Try now (kirchoff's 2nd law is kind of hard to explain on paper :( ) -
Physics: Post your doubts here!
From my understanding, the answer should be C. So first, know that even though the force is called 'up'thrust, it acts against the motion of the body and hence downwards. The only force from the three forces that IS acting upwards is the contact force. The weight also, obviously, acts... -
Physics: Post your doubts here!
The wave is passing through a point, and the displacement-time graph is drawn for that. P is not a point on the wave, rather P is the point the wave is passing through (think about it, there's a difference). Any how, even if you don't get it, it makes no difference to your answers. The intensity... -
Physics: Post your doubts here!
The charge of the alpha particle is 2x the elementary charge (charge of a single electron/beta particle). [obviously the sign changes but that doesn't matter since it's only a ratio] The mass of the alpha particle is 4x the rest mass of a proton (1.67 × 10^–27 kg). Both these^ values are... -
Mathematics: Post your doubts here!
Apparently, the mark scheme is wrong. -
Statistics P6 Help needed
A number is even when its last digit is even. So we fix the even numbers at the end of the numbers, one by one. _ _ _ _ _ _ 2 - here the number of arrangements is 6! _ _ _ _ _ _ 6 - here the number of arrangements is 6!/2! _ _ _ _ _ _ 8 - here the number of arrangements is 6!/2!. So total... -
Statistics P6 Help needed
Did you make them? Have you checked ALL of them? Are you an examiner? If the answer to anyone of the question is no, then that is a pretty bold and perhaps asinine remark to make. Over the years there have been numerous mistakes in the mark schemes. Some were misprints, but many were (and... -
Statistics P6 Help needed
According to my teacher, the mark scheme for the question I asked is wrong. Splendid! :coffee: -
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Statistics P6 Help needed
Kind sire, I understand what we have to do in order to get congruent answers as the mark scheme. I don't get why we have to do it? Is there a rule when we have to find the boundaries? Thanks again. -
Statistics P6 Help needed
So? I think I faintly get you point, but still I'm attaching a picture of an example from the Steve Dobbs S1 book which has the masses given and yet they still use class boundaries (why?): Did you, or did you not use class boundaries here? If not, why not? Thanks!! :D -
Statistics P6 Help needed
I don't think it would be possible for you to find the standard deviation if you only have the cumulative graph with you, without any actual values. (if they have crosses plotted on the graph, those would be your values). If you do have the values, find the frequencies. Then find the mean. And... -
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Poll: Which science subject do you find the hardest in as/a levels?
Physics is tough for me. If they give you a tough, tricky question... there's no way out of the trap. :( -
Statistics P6 Help needed
http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w11_qp_62.pdf In question 4(iv) shouldn't we be first finding out our class boundaries? The mark scheme directly used the values in the table for the histogram. According to me... -
Chemistry 21
You, sir thought way too much for the question. Here's the link to a similar reaction and it tells you what happens to the equilibrium yield when you have a higher pressure: http://webpages.sou.edu/~chapman/ch203/Ch15/15_56.html