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Physics: Post your doubts here!

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hassam

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omg said:
http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_w07_qp_4.pdf
can smbody explain q7 part c to me please!! :cry:
Click to expand...
see Kr has half life of 3 s.....there are two ways....one that u can set up an equation but thats more error prone so better off stick with the second method.........that after 1st 3 s Kr wd be 1/2.....after another 3 s it wud be 1/4th ......and after another 3 it wud be 1/8th whereas because of comparatively very big half life of Ba.....it wud decay be very small amount so after approx. 9 sec rattio will become 8
@OMG i Wanted to ask about an upper part of this question that why is fission energetically feasible......so ms was saying greater binding energy of products compared with reactants....bt how does it explain the energitcally feasible thing
 
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hassam

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how will i determine the frequency of unmodulated carrier wave
 

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rz123

rz123

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Oliveme said:
Asalam-o-alaikum :)
Can you please help with these physics paper 1 questions?
Questions 13, 14, 16, 25, and 33. Thank you very very much. :)
http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_s05_qp_1.pdf

Please help me with these? :(
Click to expand...
14 D as the resultant together with other forces should originate from the same point. it should be springing outwards n upward direction. we can't show dat on a ppr so D looks appropriate in this case i guess.

16: the gradient will show us the power so the graph looks steepest from 2 till 3 seconds. the rise during this time is 30 joules and the time is 1 second so P= W.d / Time = 30W
 
omg

omg

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hassam said:
see Kr has half life of 3 s.....there are two ways....one that u can set up an equation but thats more error prone so better off stick with the second method.........that after 1st 3 s Kr wd be 1/2.....after another 3 s it wud be 1/4th ......and after another 3 it wud be 1/8th whereas because of comparatively very big half life of Ba.....it wud decay be very small amount so after approx. 9 sec rattio will become 8
@OMG i Wanted to ask about an upper part of this question that why is fission energetically feasible......so ms was saying greater binding energy of products compared with reactants....bt how does it explain the energitcally feasible thing
Click to expand...
i didnt get it???? actually i didnt understand the QUestion statement!! pls if u could helpp :(
 
leadingguy

leadingguy

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omg said:
i didnt get it???? actually i didnt understand the QUestion statement!! pls if u could helpp :(
Click to expand...



@ OMG
in the question the time is asked for the ratio of undecayed nuclie of Ba /Kr
we know that the no. of undecayed nuclie could be found out by the formula of N = N0e^-lmda.t
now it is given that the ratio of N(BA)/N(Kr) =8 means that N0e^-lmda(Ba).t /N0e^-lmda(Kr).t = 8

now simplify the equation u will get e^- lmda.t/e^-lmda.t as the N0 is cancelled at both sides and lmda and T both are having different values for Ba and Kr will remain as they are


from the given eq. find the value of lamda of Ba and lamda of Kr. from this frmula [lmda= ln2/t0.5


puit it into the remainng eq. u will get the value of T
this value is the time for the nuclie to come atthe situation where the ratio of BA/Kr is 8






did u gt it??? if nt let me know! i will make it even better and easier
 
omg

omg

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USMAN ALI (MANI) said:
@ OMG
in the question the time is asked for the ratio of undecayed nuclie of Ba /Kr
we know that the no. of undecayed nuclie could be found out by the formula of N = N0e^-lmda.t
now it is given that the ratio of N(BA)/N(Kr) =8 means that N0e^-lmda(Ba).t /N0e^-lmda(Kr).t = 8

now simplify the equation u will get e^- lmda.t/e^-lmda.t as the N0 is cancelled at both sides and lmda and T both are having different values for Ba and Kr will remain as they are


from the given eq. find the value of lamda of Ba and lamda of Kr. from this frmula [lmda= ln2/t0.5


puit it into the remainng eq. u will get the value of T
this value is the time for the nuclie to come atthe situation where the ratio of BA/Kr is 8






did u gt it??? if nt let me know! i will make it even better and easier[/quote]
Click to expand...
thankyou so much :)
i have one other qs too :/ ?
 
omg

omg

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and i wanted to ask is there any site or sth were i can get the experiment design qs for p5, solved!??
 
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