A filament electron with 75 keV of kinetic energy passed close to a nucleus and slows, losing kinetic energy. When the filament electron travels beyond the nucleus, its kinetic ene... A filament electron with 75 keV of kinetic energy passed close to a nucleus and slows, losing kinetic energy. When the filament electron travels beyond the nucleus, its kinetic energy is now 40 keV.
Understand the Problem
The question describes a scenario where an electron loses kinetic energy as it passes near a nucleus. The initial kinetic energy is 75 keV, and the final kinetic energy is 40 keV. The question likely wants us to calculate something related to this energy loss, such as the amount of energy lost, the percentage of energy lost, or potentially infer something about the interaction with the nucleus.
Answer
The change in kinetic energy is 35 keV.
The change in kinetic energy of the filament electron is 35 keV. This is calculated by subtracting the final kinetic energy (40 keV) from the initial kinetic energy (75 keV).
Answer for screen readers
The change in kinetic energy of the filament electron is 35 keV. This is calculated by subtracting the final kinetic energy (40 keV) from the initial kinetic energy (75 keV).
More Information
The electron loses kinetic energy as it interacts with the nucleus, converting some of its energy into other forms, such as electromagnetic radiation (Bremsstrahlung) or excitation of the nucleus.
Tips
Pay close attention to the wording of the question. 'Change in kinetic energy' implies finding the difference between the final and initial states.
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