Recent content by Knight

I solved it. Thanks :smile:

An ideal gas undergoes a reversible, cycli process. First it expands isothermally from state A to state B. It is then compressed adiabatically to state C. Finally, it is cooled at constant volume to its original state, A. I have to calculate the change in entropy of the gas in each one of the...

Let me explain this problem better. What I have to do is calculate the propability that the measured energy from this system is E2 O.K. So I have to find the Fourier coefficients, when I expand the initial state I mentioned above from 0 to b/2 in the eigenfunctions of the energy operator, or...

There is an initial state Psi(x) =Ax(b/2 - x) when 0< x <b/2 and Psi(x) = 0 when b/2 < x <b I have to find the second lowest value possibly be obtained in a measurement of the energy. Should I treat this as a box with width b and possible energy states E=n^2*h^2/8mb^2 ? Or should I use...

That was easy. Thanks.:smile:

Hi. I have to show that x(t)=c1 cos(wt) + c2 sin(wt) '(1)' and x(t) = A sin(wt + phi) are equivalent. I know I have to use sin(alpha + beta) = sin(alpha)cos(beta) + cos(alpha)sin(beta) or cos(alpha +beta)= cos(alpha)cos(beta) - sin(alpha)sin(beta) I have been strugling with this...