Physics Principles and Problems 2009

Section 29.2 : Electronic Devices

Self-Check Quizzes

1
A reverse-bias diode acts as a very high-value _____ .
A)battery
B)semiconductor
C)transistor
D)resistor
2
What is a transistor used for?
A)to produce laser light
B)as a battery
C)as a dopant
D)to increase current
3
Microchips are made by doping _____ with donor and acceptor atoms.
A)silicon
B)diodes
C)metal plates
D)long wires
4
Where are depletion layers formed?
A)in silicon chips
B)at boundaries between p- and n-type regions of a diode
C)on the ends of diodes
D)where the current is strongest
5
How do light-emitting diodes emit light?
A)They store light from the Sun and emit it back.
B)They are made from elements that glow naturally.
C)Electrons and holes combine and energy is released at the wavelength of light.
D)They need the energy from a hydrogen cell.
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