Find the probability current density for a 1-dimensional plane wave function of the form ψ(x, t)-ae*(p-e) where e-p2/2m. 5) use the result from problem (4) to explicitly evaluate all of the wavefunction parameters (a, p, e) for a beam of electrons moving along the + x-direction with a current of 1 ma and an energy of 2 kev

What happens to the velocity of the car when the upward pull of the cable is greater than the downward pull of gravity as the car rises toward the top?

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c

Why is the basic problem of economic, scarcity, a universal problem?