An alpha particle reaches 28 fm in a gold foil experiment before it lost all of its kinetic. energy. Estimate the kinetic energy of the alpha particle
An alpha particle reaches 28 fm in a gold foil experiment before it lost all of its kinetic. energy. Estimate the kinetic energy of the alpha particle
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Transcribed Image Text:An alpha particle reaches 28 fm in a gold foil experiment before it lost all of its kinetic energy. Estimate the kinetic energy of the alpha particle
Expert Solution
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Concept and Principle:
- Since the nucleus is positively charged it will repel any positive charge that gets close to it. Thus a positive particle will slowly lose its kinetic energy when it gets closer to the nucleus and will be converted into potential energy.
- The distance of the closest approach is the distance at which the particle loses all its kinetic energy. it is given by,
Here ε0 is the permittivity of free space, z is the atomic number of the projectile, Z is the atomic number of the target, e is the charge of the electron, and K is the kinetic energy of the projectile.
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