Electron Emission

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Physics
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10th - 12th Grade
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What prevents free electrons in metals from leaving the surface?
The repulsive force of other electrons
The attractive force of the nucleus
The magnetic field of the metal
The gravitational pull of the Earth
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the unit of measurement for the work function of a metal?
Newtons
Watts
Electron volts
Joules
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which factor does NOT affect the work function of a metal?
Presence of an electric field
Surface impurities
Temperature of the environment
Nature of the metal
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In which process do electrons gain energy from heat to leave a metal surface?
Chemical emission
Thermionic emission
Photoelectric emission
Field emission
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the term for electrons emitted when light hits a metal surface?
Lightons
Field electrons
Photoelectrons
Thermions
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