Electric field on electrons. ✔3 Consider an electron with initial velocity 1 m/s in the x direction. We turn on an electric field of -1 V/m in the x direction. 1) What is the momentum of the electron? 9.1e-31 Submit Submit 2) Now, let's consider the case where this electron is in free space and treat it completely classically. Remember that F=d. What is its velocity after 10- 5 s? 1758240 Your submissions: 1758240 ✓✔ Computed value: 1758240 Submitted: Tuesday, February 21 at 3:36 PM Feedback: kg m/s Submit + Your submissions: 1154628.139 X Computed value: 1154628.139 Submitted: Tuesday, February 21 at 3:57 PM Feedback: 3) Now consider the electron in a material with a gap of 5 eV. Because of the gap, in order to increase the electron's momentum, the electric field must increase the electron's energy by 5 eV, which is impossible without applying ultraviolet light. In this case, what is the electron's velocity after 10-5 s in the electric field? 1154628.139 m/s m/s

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Electric field on electrons.
3
Consider an electron with initial velocity 1 m/s in the x direction. We turn on an electric field of -1 V/m in the x direction.
1) What is the momentum of the electron?
9.1e-31
Submit
2) Now, let's consider the case where this electron is in free space and treat it completely classically. Remember that F = dp. What is its velocity after 10-
5 s?
1758240
Submit
Your submissions: 1758240
Computed value: 1758240
Submitted: Tuesday, February 21 at 3:36 PM
Feedback:
kg m/s
Submit
3) Now consider the electron in a material with a gap of 5 eV. Because of the gap, in order to increase the electron's momentum, the electric field must
increase the electron's energy by 5 eV, which is impossible without applying ultraviolet light. In this case, what is the electron's velocity after 10-5 s in
the electric field?
1154628.139
Your submissions: 1154628.139 | X
Computed value: 1154628.139
Submitted: Tuesday, February 21 at 3:57 PM
Feedback:
m/s
m/s
Transcribed Image Text:Electric field on electrons. 3 Consider an electron with initial velocity 1 m/s in the x direction. We turn on an electric field of -1 V/m in the x direction. 1) What is the momentum of the electron? 9.1e-31 Submit 2) Now, let's consider the case where this electron is in free space and treat it completely classically. Remember that F = dp. What is its velocity after 10- 5 s? 1758240 Submit Your submissions: 1758240 Computed value: 1758240 Submitted: Tuesday, February 21 at 3:36 PM Feedback: kg m/s Submit 3) Now consider the electron in a material with a gap of 5 eV. Because of the gap, in order to increase the electron's momentum, the electric field must increase the electron's energy by 5 eV, which is impossible without applying ultraviolet light. In this case, what is the electron's velocity after 10-5 s in the electric field? 1154628.139 Your submissions: 1154628.139 | X Computed value: 1154628.139 Submitted: Tuesday, February 21 at 3:57 PM Feedback: m/s m/s
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