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GATE 2013 Question and Answers Comment Here, with explanation of answers..

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1. The isospin and baryon number of a U quark.

1. prob curr density prob 0.25

2. they asked in the inverse lattice no so the bcc is fcc and use reciprocal lattice vector formula to find the magnitude

3. if any one remember the data of zeeman effect prob pls post here

2. pls post question paper

3. 1/2. 1/3

4. Up quark is isospin doublet so isospin is 1/2 and baryon no. is 1/3.

1. 1/2
1/3

anjali ahalawat

5. bcc lattice question,question on superconductor, match about phonon polariton,free energy first transition,four indistinguisable particle on five boxes,same type question on fermion,second order tensor pressure moment of inertia,stress,strain,the problem for some questions dont have any choics you just have to enter the numerical values reduces the arbitrariness and finding answe r by eliminating choices.aptitude seems a bit easy comparing previous papers.

6. It is correct answer for U quark.

7. ya its 1/2 and 1/3

8. wt about the no of spectral lines in sodium 2D to 2P transitions...??

1. eight....

2. how its 8?, for 2D l=2.s=1/2,for 2p l=1, s=1/2 so j=5/2 and 3/2 for 2D. and j=3/2 and 1/2 for 2p. and now j has 2j+1 values.

3. 5 spectral lines

4. spin multiplicity is S=2s+1 so calculate for resultant s for no of spectral lines

5. This comment has been removed by the author.

6. no its not 5 not 8 not 12...........ok

7. there may be no of transitions corresponds to single spectral line so they asked practically observed spectrl lines among all transitions

8. 2D->2P transitions are diffuse series transition so it has only Triplet so 3 lines alone appears

9. 2D 5/2, 2D 3/2 , 2P 3/2 , 2P 1/2 since the transition from 2D 5/2 to 2P 1/2 is forbidden so no line hence 2D 5/2 to 2P 3/2 , 2D 3/2 to 2P 3/2, 2D 3/2 to 2P 1/2 will give weak , weaker and weakest line respectively.

9. 1)wt was the expectation value of s.j in given magnetic moment?
2)wt was the expectation value of exp(ia.p)for an ideal gas in MB statistics.
3) wt was the degenerate value of a 3*3 matrix having diagonal element equal to 4 and rest were -1?

1. the degenerate eigen value is 5 (I got).

2. yes it is 5

3. yes it is 5

10. ya it is 1/2,1/3

11. relativistic force solution ?

12. what about the force and acceleration relation in relativity. My answer could not match any four of them. Later i checked my scratch paper answer on beiser book. it's matched. So guys whats your take on this.

1. (C) option

2. what was that c option

13. canonical momentum problem..L=alpha.q(dot)square-beta.q square

1. ya its correct but its not conserved so its not cyclic coordinate

14. hey any solved the spin matrix problem check it i gt 2.8 check it i think i m sure

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