1)Pitch is measure of the of sound. (a) amplitude (b) wavelength (c) time period (d) frequency

2)A book placed on a shelf can be seen from any part of that room due to .

(a) regular reflection

(b) clear reflection

(c) diffused reflection

(d) parallel reflection

3)Two mirrors A and B are placed at right angles to each other. A ray of light incident

on mirror A at an angle of 25° falls on mirror B after reflection. The angle of reflection

for the ray reflected from mirror B would be

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

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2

Aphase diagram assumes is kept constant.