Question

A helium atom has two electrons, let us call them electron 1 and 2. Suppose electron 1 is in the ground state and electron 2 is in the first excited state. 1. Calculate the minimum energies (in eV) of photons needed to eject each electron out of the atom. [5 points) 2. Draw an energy level diagram for a helium atom and indicate the transitions in part 1. You do not need to calculate the energies of various energy levels. [5 points) 3. Calculate the frequency (in Hz) and wavelength (in nm) of the two photons involved in the above transitions. [5 points) 4. On a single figure, draw two curves showing the kinetic energy of each electron ejected as a function of frequency of the incident photon. Label which curve corresponds to which electron and the minimum frequencies that you calculated in part 3. [5 points)

Answer 1

ANSWER

Q.1. the given 32 energy of an election in the nth oabit is. by n = 2 Dankee 2 br -13-6 x 2² ev. the election , which is in the gwundstale = 1 of 2=2. i Ę = – 13.642 - 54.4 eV. for r. elect the The enegy required by the photous to ground state electrona 54.4ev. frost excited For the state . electrons which is in the D=2 d 222. Er = - 13.6x22 – – 13.6ev. 22 i The energy required by the photous to eject the second electson = 13.6ev. . caly one question is NB. As per allowed to Chege guidelines answer.