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A P-type semiconductor has acceptor levels 57 meV above the valence band. What is the maximum wavelength of light required to create a hole?
A P-type semiconductor has acceptor levels 57 meV above the valence band. What is the maximum wavelength of light required to create a hole?
What is the current in the circuit?
What is the current in the circuit?
What should be the value of the resistor R, connected in series with the diode for obtaining maximum current?
What should be the value of the resistor R, connected in series with the diode for obtaining maximum current?
For a transistor amplifier in common emitter configuration with a load impedance of 1 kΩ, what is the current gain if hfe = 50 and hoe = 25 μΑ/V?
For a transistor amplifier in common emitter configuration with a load impedance of 1 kΩ, what is the current gain if hfe = 50 and hoe = 25 μΑ/V?
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What will be the output voltage of the amplifier using an NPN transistor with current gain β = 100 in common emitter configuration?
What will be the output voltage of the amplifier using an NPN transistor with current gain β = 100 in common emitter configuration?
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What type of semiconductor is indicated if the concentrations of electrons and holes are 8 × 10^18/m3 and 5 × 10^18/m, respectively, with mobilities of electrons and holes at 2.3 m2/volt-sec and 0.01 m2/volt-sec?
What type of semiconductor is indicated if the concentrations of electrons and holes are 8 × 10^18/m3 and 5 × 10^18/m, respectively, with mobilities of electrons and holes at 2.3 m2/volt-sec and 0.01 m2/volt-sec?
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Study Notes
Semiconductor Physics
- A P-type semiconductor with acceptor levels 57 meV above the valence band requires a minimum energy of light to create a hole, corresponding to a maximum wavelength of 217100 Å.
Current and Diodes
- The current in a circuit can be calculated by considering the voltage drop across a diode, which can have a constant voltage drop of 0.5 V at all currents.
- A diode with a maximum power rating of 100 milliwatts requires a series resistor with a value of 6.67 Ω to obtain maximum current.
Transistor Amplifiers
- A transistor amplifier in common emitter configuration has a current gain (β) that depends on the load impedance, hfe, and hoe.
- For a load impedance of 1 kΩ, hfe = 50, and hoe = 25 μΑ/V, the current gain is -48.78.
- The output voltage of a common emitter configuration amplifier using an NPN transistor with β = 100 is dependent on the circuit configuration.
Semiconductor Properties
- The concentration of electrons and holes in a semiconductor affects its properties, with a concentration of 8 × 1018/m3 electrons and 5 × 1018/m3 holes resulting in a specific semiconductor type and resistivity.
- The mobilities of electrons and holes, 2.3 m2/volt-sec and 0.01 m2/volt-sec respectively, also influence the semiconductor's properties.
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Description
Multiple choice questions on semiconductor physics, including p-type semiconductors, light required to create a hole, and diode circuits.
