Chang sees the following formula on a website about
newton's second law.
what does the symbol ef in the formula indicate that
chang needs to do?
as σε
he needs to find the net force acting on the object in a
direction.
he needs to use only forces acting in the direction of
motion
he needs to combine the horizontal and vertical forces
he needs to multiply the horizontal and vertical forces.

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

Give an example in which the electrical energy changes to light energy

You can melt ice by applying pressure because the solid/liquid line has a slope.