tag:blogger.com,1999:blog-8705083632203739705.post8673676432455670919..comments2024-01-08T01:42:56.289+05:30Comments on PHYSICS Information and Links: CSIR UGC NET, 2014 Dec 21, Question Paper, Download, Answer Key, Answers, solutions, Explanations, Comment HereUnknownnoreply@blogger.comBlogger111125tag:blogger.com,1999:blog-8705083632203739705.post-45366884211286573472015-01-03T11:34:14.622+05:302015-01-03T11:34:14.622+05:30But Shraddha...In december 2011 they specifically ...But Shraddha...In december 2011 they specifically mentioned those two levels 3S1 and 1S0 . But here in this problem they told that ground state is splitting Hence F=0,1 .There is a theory that Difference in consecutive splitted levels is directly proportional to F+1 ,where F----> highest number so here =1 so Difference in energy level is directly proportional to 2 . so ans is 2ahˆ2Anonymoushttps://www.blogger.com/profile/14839300737806119178noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-69804189630089501392015-01-02T15:47:52.424+05:302015-01-02T15:47:52.424+05:3070) 4th is also kinematically forbidden!70) 4th is also kinematically forbidden!Anonymoushttps://www.blogger.com/profile/10019265255526216170noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-90513699648835650322015-01-01T13:51:17.293+05:302015-01-01T13:51:17.293+05:30In the question mass of a shell is asked.
Mass of ...In the question mass of a shell is asked.<br />Mass of a shell is = 4pi(r^2)*thickness*density<br /><br />Now, thickness= constant, density = constant<br /><br />So, mass is proportional to surface (or r^2)Azaharuddinhttps://www.blogger.com/profile/18144128025178413161noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-63510604514192353672014-12-31T20:13:24.730+05:302014-12-31T20:13:24.730+05:30What will be excepted cut offWhat will be excepted cut offAnonymoushttps://www.blogger.com/profile/09741331096947652234noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-76626700055159472782014-12-31T18:22:10.805+05:302014-12-31T18:22:10.805+05:30give answer of laurentz series question give answer of laurentz series question Anonymoushttps://www.blogger.com/profile/09905764450525475573noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-46187931745391140162014-12-31T18:21:09.288+05:302014-12-31T18:21:09.288+05:30give the answer of poisson bracket of x,p,l
give the answer of poisson bracket of x,p,l<br />Anonymoushttps://www.blogger.com/profile/09905764450525475573noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-48474720290323303442014-12-31T12:20:56.885+05:302014-12-31T12:20:56.885+05:30I have doubt on:
Question (3), (33), (39)
Corre...I have doubt on:<br />Question (3), (33), (39)<br /><br /><br /><br />Correction:<br /><br />Question (16)-----> (b) ratio of volumes = 1:2<br /><br /><br /><br />Question (44)----> (c)<br />**************************<br />Diode resistance is 500 ohm. Total resistance is 1500 ohm.<br />Now 0.7 volt is dropped across the diode. Remaining voltage= 10-0.7= 9.3 volt<br /><br />Current = (9.3/1500) = 6.2 mA<br /><br />Azaharuddinhttps://www.blogger.com/profile/18144128025178413161noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-44002902444821571702014-12-30T16:54:11.827+05:302014-12-30T16:54:11.827+05:30may be 79may be 79Anonymoushttps://www.blogger.com/profile/07069634416278902488noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-76718466016769269592014-12-30T10:49:17.792+05:302014-12-30T10:49:17.792+05:30pranab dhar is absolutely right...pranab dhar is absolutely right...usefulhttps://www.blogger.com/profile/14662046341945260227noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-58300034184340737812014-12-29T17:00:14.033+05:302014-12-29T17:00:14.033+05:30Hi friends
I think the answer of question r...Hi friends<br /> I think the answer of question related to mass of the shell (q.no 20 in booklet B) will be option (4) i.e the mass of any shell is proportional to surface area of each shell.<br /><br />Explanation:<br />Let us consider a shell of radius r and negligibly small thickness dr , then its volume = 4*pi*r^2*dr<br />therefore its mass = 4*pi*r^2*dr*d (d= density)<br />From this it seems the mass is directly proportional to r^2 (as dr is arbitrary, d is constant)<br />But proportional to r^2 is not given in any option. So it must be proportional to surface area S (=4*pi*r^2).<br />Here I also want to mention that all the answer key given by Career Endeavour may not be correct.Last time also this happened.<br />But more than 90% answer are correct.Anonymoushttps://www.blogger.com/profile/08533353377826952057noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-7495619146564215372014-12-29T16:51:55.811+05:302014-12-29T16:51:55.811+05:30What will be expected marks for generalWhat will be expected marks for generalAnonymoushttps://www.blogger.com/profile/08757713307397901108noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-44855477068302005122014-12-29T15:53:56.316+05:302014-12-29T15:53:56.316+05:30bcz of given lorenz condition is wrongbcz of given lorenz condition is wrongAnonymoushttps://www.blogger.com/profile/02311915648289133655noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-24911594527066282442014-12-29T15:52:20.073+05:302014-12-29T15:52:20.073+05:30Q 54 booklet c is wrong peasle cheke itQ 54 booklet c is wrong peasle cheke itAnonymoushttps://www.blogger.com/profile/02311915648289133655noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-65485990749834643932014-12-28T22:25:53.473+05:302014-12-28T22:25:53.473+05:30thanks for the explanation shraddha plz, also disc...thanks for the explanation shraddha plz, also discuss Q59 in booklet B, expectation value of =(h/mw)^1/2 or =(h/2mw)^1/2 with Co=1/root2 in 1-D harmonic oscillator.& Q36 in booklet B, represenation of hamiltonian H=wxp quantum-mechanically isn't <br />-ihwxd/dx option 3 should be the answer...kartikhttps://www.blogger.com/profile/03424161850698941364noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-46367159241946611032014-12-28T19:33:55.214+05:302014-12-28T19:33:55.214+05:30Kartik same question asked in dec 2011.correct ans...Kartik same question asked in dec 2011.correct answer is ah^2.explaination <br />Total spin s=s[electron]+s(proton)<br />squaring above eqn<br />s^2=se^2+sp^2+2s(e)s(p)<br />s(e)s(p)=1/2[s^2-s(e)^2-s(p)^2]<br />H=as(e)s(p)=a/2[s^2-s(e)^2-s(p)^2]<br />S(e)^2=s(p)^2=s(s+1)h^2=3/4h^2<br />H=a/2(s^2-3/4h^2-3/4h^2)<br /> =a/2[s^2-3/4h^2]<br />3s1gives s=1;s^2=s(s+1)h^2=2h^2<br />1so gives 0h^2<br />H1=a/2[2-3/2]h^2=a/4h^2 for 3s1<br />H2=a/2[0-3/2]h^2=-3/4ah^2 for 1so<br />splitting between 3s1and1so is<br />H=H1-H2=(1/4+3/4)ah^2=ah^2<br />So answer is ah^2<br />Here pls consider h as h cross.on mobile there is no symbol for h cross. So i used h only.<br /><br /><br />Anonymoushttps://www.blogger.com/profile/08757713307397901108noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-90011871285337674042014-12-27T22:09:14.259+05:302014-12-27T22:09:14.259+05:30splitting of energy levels due spin-spin interacti...splitting of energy levels due spin-spin interaction b/w elctron & proton should be 2ah^2 & not ah^2 acc. to stndard book griffith "introduction to quantum mechanics "hence ans should Q-72-option2 & not option3 of booklet-B 2014(II) as given by career endeavour.kindly cross-check .kartikhttps://www.blogger.com/profile/03424161850698941364noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-3799462162304999702014-12-27T20:42:46.253+05:302014-12-27T20:42:46.253+05:30When csir key will publishWhen csir key will publishAnonymoushttps://www.blogger.com/profile/08757713307397901108noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-924179614241500532014-12-27T20:04:57.689+05:302014-12-27T20:04:57.689+05:30the problem in this website (http://www.algebra.co...the problem in this website (http://www.algebra.com/algebra/homework/word/geometry/Geometry_Word_Problems.faq.question.101764.html) says<br /><br />"Since volume is proportional to the cube of the radii, then mass is also proportional to the cube of the radii"Vinohttps://www.blogger.com/profile/02429475159796801870noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-24538846310689686222014-12-27T20:00:16.434+05:302014-12-27T20:00:16.434+05:30when we expand the volume term ie.in case sphere i...when we expand the volume term ie.in case sphere it is 4/3 pie R^3 in this R is variable everything else(4/3 pie) come out from integral & radius term will integrate to make it to the volume. kartikhttps://www.blogger.com/profile/03424161850698941364noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-52312389357472364572014-12-27T19:58:57.591+05:302014-12-27T19:58:57.591+05:30http://www.algebra.com/algebra/homework/word/geome...http://www.algebra.com/algebra/homework/word/geometry/Geometry_Word_Problems.faq.question.101764.html<br /><br />This will give an insight...Vinohttps://www.blogger.com/profile/02429475159796801870noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-65332990215074281212014-12-27T19:53:46.343+05:302014-12-27T19:53:46.343+05:30question itself says increasing radii, mass propor...question itself says increasing radii, mass proportional to radius ..all the other things are constants...hance option-c should be correct.kartikhttps://www.blogger.com/profile/03424161850698941364noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-4355477115851668942014-12-27T19:44:45.214+05:302014-12-27T19:44:45.214+05:30What about this argument then?
Mass/Volume = Dens...What about this argument then?<br /><br />Mass/Volume = Density = constant (for any material)<br /><br />Thus Mass = Constant * Volume<br /><br />Hence, Mass is proportional to Volume...Vinohttps://www.blogger.com/profile/02429475159796801870noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-1803053500657749302014-12-27T19:41:50.568+05:302014-12-27T19:41:50.568+05:30yes correct, b'coz itself in the question it i...yes correct, b'coz itself in the question it is written increasing radii...all the other things ie, are constants, answer should be mass be proportional to radii...kartikhttps://www.blogger.com/profile/03424161850698941364noreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-81796770881349650362014-12-27T19:35:47.216+05:302014-12-27T19:35:47.216+05:30but i think it should be the radius.....coz in bot...but i think it should be the radius.....coz in both the cases whether its volume or surface are only radius is variable but all the other terms are constant....i think option c is correctAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-8705083632203739705.post-59762710705028140052014-12-27T19:29:36.981+05:302014-12-27T19:29:36.981+05:30i also think iti also think itAnonymousnoreply@blogger.com