Suppose you are standing with two heavy rocks high up on a tall building. You throw one rock down with an initial speed of 2 m/s; you just let go of the other rock. What is the di erence in the speeds of the two rocks after 5 seconds|is it less than, more than, or equal to 2 m/s?

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

Consider the particle-in-a-box problem in 1d. a particle with mass m is confined to move freely between two hard walls situated at x = 0 and x = l. the potential energy function is given as (a) describe the boundary conditions that must be satisfied by the wavefunctions ψ(x) (such as energy eigenfunctions). (b) solve the schr¨odinger’s equation and by using the boundary conditions of part (a) find all energy eigenfunctions, ψn(x), and the corresponding energies, en. (c) what are the allowed values of the quantum number n above? how did you decide on that? (d) what is the de broglie wavelength for the ground state? (e) sketch a plot of the lowest 3 levels’ wavefunctions (ψn(x) vs x). don’t forget to mark the positions of the walls on the graphs. (f) in a transition between the energy levels above, which transition produces the longest wavelength λ for the emitted photon? what is the corresponding wavele

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body