Question: a) An electron occupies the highest energy level of the valence band in a diamond crystal. What is the maximum photon wavelength that will excite the electron into the conduction band? In diamond, the energy gap between the valence and conduction bands is 7eV.
b) Mr Smith refuses to believe that a potential difference can be created simply by bring two different metals into contact with each. How will you convince Mr Smith that it is possible to create potential difference in this manner.
c) You can not see anything smaller than a wavelength of the wave used to make the observation. What is the minimum energy of an electron needed in an electron microscope to see an atom that has a diameter of about 0.1 nm ?
d) What is a wave packet ?
e) Write a note on the origin of energy bands in solids.