rev 4.0 7. Shown below are the energy levels of the element cesium. Ionization 3
ID: 2305107 • Letter: R
Question
rev 4.0 7. Shown below are the energy levels of the element cesium. Ionization 3.9eV 2.4eV 1.4eV 0eV a) P: Electrons of specific energies collide with gascous cesium atoms. Both perfectly elastic collisions (i.e. objects bounce apart and energy is conserved) and perfectly inelastic collisions (i.e. objects stick together and travel with common final velocity) occur. What are the possible energies of the electrons emerging if the energy of the electrons colliding are: i) 1.0eV? ii) 2.0eV? iii) 2.6eV? iv) 3.2eV? b) P: An electron of energy 1.8eV collides with a cesium atom in the ground state. c) P: What is the minimum energy that aibombarding electron must have in order to d) P: What is the minimum energy that a bombarding electron must have in order to After the collision the electron is found to have 0.4eV of energy. Relative to the ground state, what is the energy of the cesium atom after the collision? excite a cesium atom? ionize a cesium atom?Explanation / Answer
A) i) emergence elctron has same energy as it will collide elastically as its energy is less then excited state of CS.
ii) In this case it collide inelasically and tranfer energy to cs atom goes to higher excited level. The move with the remaining energy . i.e. 0.6eV
iii)In this case also there will be inelastic collision Cs goes to next higher state. the electron move with .2eV
In this case CS may exicte also at 1.4 eV state with electron having energy 1.2 eV.
iv) this follows the same as iii) except electron move with energy .8 eV.
b) according to energy conservation the energy of CS atom is 1.4eV.
c)minimum energy is 1.4eV
d) to ionize Cs atom it require more than 3.9eV energy.
(see quantization of atomic energy level)
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