Recent content by Helpless guy

Homework Statement Given a quantum density ρ=w1|φ1><φ1|+w2|φ2><φ2| where φ1=c(1/2)*exp[-(x-b)2/2c2] φ2=c(1/2)*exp[-(x+b)2/2c2] find the density of probability of finding x0 if X(operator) is measured Homework Equations PA=Σwi(Σ|<a;α|φi>|2) The Attempt at a Solution I know that the probability...

Thank you so very much! It's a brilliant idea.

Homework Statement Given this image http://postimg.org/image/m9dyiqwy3/ find the lattice parametre of the reciprocal lattice and the coordinates of the point x. Homework Equations a*[/B]=2π(b×c)/(a⋅b×c) b*=2π(c×a)/(b⋅c×a) c*=2π(a×b)/(c⋅a×b) Which are the vectors of the reciprocal lattice a is...

Homework Statement I have a fcc structure, the net parametre is 4.46*10-10m, the potential energy/mol is -1.88kJ/mol. My task is to find the parametres ε and σ of the potential. Homework Equations Φ=-4ε[(σ/r)6+(σ/r)12] The Attempt at a Solution I can find the value of r using the net...

Thank you very much for your anwsers, I am almost sure I have to say that is only thanks to the small angle that I can measure the distance on the photo because of the small angle; I have made some experiments with the shadows of two books and a table lamp, only for small angles the distances...

You are right, the photo is taken from the top of a building, the shadow makes a small angle of 4 degrees with the lamp itself, I have checked that the lamp is almost parallel to to the edge of the photo., so the only I can think of is saying that since the angles are small, if I am measuring...

Homework Statement Hi everybody; a teacher of mine has given me a photo of two street lampd and their shadows; he has said to me that it's height is 3 metters, and the distance between the lamps is metters, and with that information I should be able to tell the length of the shadow. The image...