Law of conservation of energy:
, where Wnc is the work done by non-conservative forces such as friction.
In this case, we do not have Wnc since there are no non-conservative forces.
Wnc = 0
Since the electron is in motion, the initial potential energy is zero.
Ui = 0
Also, Kf = 0 since the electron is coming to rest.
Kinetic energy is expressed as:
What potential difference is needed to stop an electron that has an initial velocity V = 6.0 × 105 m/s?
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