1. Calculate the wavelength of an electron accelerated through a 2000 V voltage, expressing the result in nanometers and rounding it to three decimal places. 2. What is the energy (in eV) of photon emission when the electron transitions from 4p to 1s? For this question use: 1eV = 1.6 x 10-19 Joules, and assume the ground state energy for the electron in H is -13.6 eV. 3. Draw an energy band diagram for a metal with a work function of 5.10 eV separated by an air gap from another metal with a work function of 4.28 eV. When these two metals are brought into contact, illustrate the equilibrium band diagram and calculate the contact potential. Edit View Insert Format Tools Table