Serway_PSE_quick_ch42

Serway_PSE_quick_ch42 - Physics for Scientists and...

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Unformatted text preview: Physics for Scientists and Engineers, 6e Chapter 42 - Atomic Physics A hydrogen atom is in its ground state. Incident on the atom are many photons each having an energy of 10.5 eV. The result is that 1 2 3 33% 33% 33% 1 2 3 4 5 1. the atom is excited to a higher allowed state 2. the atom is ionized 3. the photons pass by the atom without interaction Because the energy of 10.5 eV does not correspond to raising the atom from the ground state to an allowed excited state, there is no interaction between the photon and the atom. When electrons collide with an atom, they can transfer some or all of their energy to the atom. Suppose a hydrogen atom in its ground state is struck by many electrons each having a kinetic energy of 10.5 eV. The result is that 1 2 3 33% 33% 33% 1 2 3 4 5 1. the atom is excited to a higher allowed state and the electrons pass by the atom without interaction 2. the atom is ionized 3. the atom is excited to a higher allowed state and the atom is ionized A hydrogen atom makes a transition from the n = 3 level to the n = 2 level. It then makes a transition from the n = 2 level to the n = 1 level. Which transition results in emission of the longest-...
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Serway_PSE_quick_ch42 - Physics for Scientists and...

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