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A model for how air becomes ionized in a spark focuses on energy. Suppose that a very energetic particle collided with a nitrogen or oxygen atom and knocked out an electron, ionizing the molecule. Estimate the kinetic energy required for this process. What is the change in electric potential energy of the system of the electron plus the atomic core in this process?
What are some issues facing cities in North Africa?
Big cities in North Africa are becoming overcrowded. There are not enough houses and apartments for all people because the population is growing strongly. Furthermore, large numbers of people from poor countries migrate to the North African area which is also a problem.
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