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Did you give variant 2 I am giving variant 1 have exams in abt 4 hrsHOW WAS THE EXAM?!
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Did you give variant 2 I am giving variant 1 have exams in abt 4 hrsHOW WAS THE EXAM?!
Yeah same here!Did you give variant 2 I am giving variant 1 have exams in abt 4 hrs
amazing yet confusingHOW WAS THE EXAM?!
All my questions went well except for uncertainty nd that ratio part :/Just did Physcis AS paper 22. Was great and a smooth paper although Q 6 was tough.
Yes, after you add 0.02, you have to take into consideration the other information they give you which is +-1 digit. Since it's asking for the maximum, you'd obviously use +1 digit. I know it's kind of confusing but I see no other explanation for this!http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_ms_23.pdf
Q1 a ii)
How to do it i mean apart from adding 0.02, why do we add 0.01, is it because of the +-1 digit.
Thank you! I was over looking the molar ratio part. JazakAllah! May Allah help you like you helped me.I'm not able to understand your question; hopefully this guess might help, if not i'm sorry, could you explain again?
Uranium-235, according to the given equation, can decay into Barium-141 and Krypton-92; each nucleus in the sample used will undergo this reaction, and since the equation is balanced for conservation of charge and mass, each nucleus of Uranium, when hit by a neutron, will produce 1 nucleus of Barium, another of Krypton and 3 neutrons, along with some energy.
So, when 1.2 grams of Uranium-235 decay, we need to find out how many nuclei of Barium-141 are produced. Since we have a one-one relation (i.e. one nucleus of
U-235 produces one nucleus of Ba-141) we can say that the number of Barium nuclei produced is equal to the number of Uranium nuclei that take part in the nuclear reaction. In this case, all of them react, so the number of atoms (and correspondingly, the number of nuclei) of U-235 is given by
Avogadro's Number * No. of moles
The number of moles of nuclei in the Uranium sample is given by
(Mass of Sample)/(Mass of 1 mole of element)
Substituting the values, we get
6.02 * 10^23 * 1.2/235 = 3.07 * 10^21 nuclei.
Hope this helped!
Good Luck for all your exams!
All my questions went well except for uncertainty nd that ratio part :/
STOP DISCUSSING PAPER :/Were there many or few definitions ??
All was good or any doubts?My paper was awesome, I request to not discuss till 24 hours. PLEASE >.>
I had doubt in only 1 part, and I forgot where I was having it... I think might be in waves partAll was good or any doubts?
I hv in 2 questions probably would get some marks if they r wrong evenI had doubt in only 1 part, and I forgot where I was having it... I think might be in waves part
hmm.. we'll discuss tomorrowI hv in 2 questions probably would get some marks if they r wrong even
We are not supposed to speak :/Were there many or few definitions ??
I dont think i can discuss that for 24 hrs sorryWere there many or few definitions ??
Kayyhmm.. we'll discuss tomorrow
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