Recent content by atay5510

  1. A

    Restrictions on the size of prokaryote molecules

    Here is the answer I got: From a survival/evolutionary standpoint, for single celled organisms to survive (such as a bacteria in a pond), it needs to be able to identify a potential source of danger (by some sensing mechanism) and transmit that information to the CPU of that cell in order to...
  2. A

    Restrictions on the size of prokaryote molecules

    This question was a lecture discussion topic during my Biophysics course at university. I missed the lecture and the question is bothering me. "Eukaryotes (multi-cell organisms) evolved into very large sizes whereas prokaryotes (single-cell organisms) remained quite small (about 1...
  3. A

    Safety Valve/Pressure System question

    Aha! So the resistance force due to the spring is F = -kx where x = 250mm - 207mm and k is as given. I feel like they are giving me a little more info in the picture than is necessary. Specifically the 400mm diameter of the tank (not the discharge hole) and the 25mm thickness of the walls. My...
  4. A

    Safety Valve/Pressure System question

    Homework Statement A valve for a pressure system has a discharge hole whose diameter is 50mm. The spring has a free length of 250mm (if you stretched the spring out), a coiled length (measured top to bottom while spring is coiled) of 207mm and a spring constant of 120kN/m. At what pressure...
  5. A

    Prove the Hamiltonian Operator is Hermitian

    Homework Statement Show that the Hamiltonian operator (\hat{H})=-((\hbar/2m) d2/dx2 + V(x)) is hermitian. Assume V(x) is real Homework Equations A Hermitian operator \hat{O}, satisfies the equation <\hat{O}>=<\hat{O}>* or ∫\Psi*(x,t)\hat{O}\Psi(x,t)dx =...
  6. A

    Graduate Internal Conversion of Bi-207/Pb-207

    Hi, I am aware that due to the three body kinematics of beta decay, the energy spectrum of the electrons emitted is a continuous spectrum (where at one extreme the electron gets all of the disintegration energy and the antineutrino none, and the converse at the other extreme) I am doing an...
  7. A

    Undergrad What the hell is a Johnson V Magnitude?

    What the hell is a Johnson V Magnitude? Is the Johnson V Magnitude the same as the Apparent Magnitude? I don't think it is. Are they related?
  8. A

    Graduate Quantum Tunneling for particles of equal energies but different masses

    so because the two particles have the same energies, it is obvious that the smaller particle must be moving at a higher velocity than the larger particle and thus have a greater uncertainty in position than the larger particle and therefore a greater probability of tunneling?
  9. A

    Graduate Quantum Tunneling for particles of equal energies but different masses

    ummm sorry still a bit confused. I thought maybe is had something to do with the uncertainty in positon of each particle? I read somewhere that the smaller the mass of the particle, the larger the uncertainty in position and thus a higher probability that tunneling will be successful? Not...
  10. A

    Graduate Quantum Tunneling for particles of equal energies but different masses

    Howdy, Can anyone explain qualitatively (without using any maths) why a particle with a smaller mass has a greater probability of tunneling through a potential barrier than another particle with a larger mass but of the same total energy? Thanks