Step-by-step explanation:
(a) The Schrodinger's wave function represent the position of a particle at a particular instant of time. It is also known as the probability amplitude. It is also used to find the location of a particle.
(b) The width of a potential well,

For first energy level, n = 1
Energy in infinite potential well is given by :


E = 0.0120 Joules
For second energy level, n = 2


E = 0.0483 Joules
For third energy level, n = 3


E = 0.108 Joules
Hence, this is the required solution.