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Problem: What potential difference is needed to stop an electron that has an initial velocity V = 6.0 × 105 m/s?

FREE Expert Solution

Law of conservation of energy:

Ki+Ui+Wnc=Kf+Uf, 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:

K=12mv2

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Problem Details

What potential difference is needed to stop an electron that has an initial velocity V = 6.0 × 105 m/s?

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