# Recent content by foranlogan2

1. ### Help cosmology introductory

can anyone give me any information on some good books, online books or lecture notes to help me with university introductory cosmology i have my lecture notes but they are very poor and i find it difficult reading and interpreting what is going on thanks
2. ### TDS ratio specific heat help

Explaining your reasoning, show that the ratio of the specifc heat is CP/CV = (DP/DV)s / (DP/DV)t hint :use TDS EQUATIONS I have used tds equation 3 and tds equation 1 and equated them,but i am stuck because i get to an equation like (CP/CV-1)(DT/DV)p = T(DP/DT)v and just do not...
3. ### Fourier Series

can anyone help me interpret what exactly this question is asking as i am quite unawares By direct substitution into the heat equation and calculation of boundary values, verify that the solution u(x, t) for a metal rod of length L which satisfies the initial temperature u(x, 0) = f(x) and...
4. ### Can anyone help thermodynamics specific heat

CVDT + T(DP/DT)vDV = TDS 1 CPDT - T(DV/DT)pDP = TDS 2 CV(DT/DP)vDP + CP(DT/DV)pDV = TDS 3
5. ### Can anyone help thermodynamics specific heat

Explaining your reasoning, show that the ratio of the specifc heat is CP/CV = (DP/DV)s / (DP/DV)t hint :use TDS EQUATIONS I have used tds equation 3 and tds equation 1 and equated them,but i am stuck because i get to an equation like (CP/CV-1)(DT/DV)p = T(DP/DT)v and just do...
6. ### Spin in Quantum mechanics

The spin of an electron is described by a vector psi = column vector with two entries,psi up and psi down Give the general expressions for the probabilities to find Sz= +or- h/2 in a measurement of S^z where Sz=h/2(1 0) as a matrix ( 0 -1) ii)Give the general...
7. ### Yukawa potential ,confused

thanks patrick i have done as said and expanded taylor series to get VGAMMA = minus (-)coulomb + q^2gamma/4(pi)eo (perturbation) so then rearange to get w expectation equals perturbation. but w = vgamma-vcoulomb not w =vgamma + coulomb which is where i have a problem and so cant rearange to...
8. ### Yukawa potential ,confused

thanks meir achuz, when i am using my hint for perturbation is V(GAMMA) MINUS V0 COULOMB. Is the coulomb potential for charges q1q2 = q^2
9. ### Rotating molecule

b) Calculate the matrix which represents the Hamiltonian H= 1{(L)^2}/2I + Alpha*(L^z) H = part A + part B where alpha is a constant and so is I and also L^2 = Lx^2 + Ly^2 + Lz^2 (1) heres what i have done. i have calculated L^2 From adding matrices from 1 and it...
10. ### Yukawa potential ,confused

could anyone help me also with this question as i am very confused,i have read my notes but i really have a problem with this stuff making anysense, any help would be appreciated thanks:redface: question 6)) The Yukawa potential is given by V°(gamma)(r) = (q)^2/{ 4(pi)(eo)0r...
11. ### Help quantum mechanics spin

The spin of an electron is described by a vector spinor and the spin operator ^S = ^ Sxi + ^ Syj + ^ Szk with components how would i go about normalizing a state like the one below,i am miles away to what is going on here c) (i) Normalise the state (1 1) *this is meant to be a column...
12. ### Thermodynamic potential question,help!

for example could it be DR =TDS + PDV + LDF FOR (SVF), AND FOR (SPF) DN = TDS + VDP + LDF ? I am just not sure what question means thats all, can anyone help?
13. ### Thermodynamic potential question,help!

i have studied my lecture notes back to front and looked high and low for a clue how to do this question but i tried in a) constructing an expression for u and came up with DU= +TDS -PDV - FDL BAUT I COULD BE MILES OUT. could anyone help. thanks here it goes: A piece of rubber of...
14. ### Can anyone help? in quantum mechanics commutator prove [L^x,L^y] = ihL^z

thanks patrick , do i use [AB,CD] relation for each 4 commutators?,like [YPz,ZPx] and also [ZPy,ZPx] etc
15. ### Can anyone help? in quantum mechanics commutator prove [L^x,L^y] = ihL^z

yeah im aware commutator rules but i just cant prove the relation ,i am confused about how to rearange and put in that form. i.e my maths might not be up to scratch but if u can help me with this little proof i might be able to crack the rest... here it goes ... z(py)x(pz) - x(pz)z(py) ,how...