Semiconductors Questions and Answers

The required conductivity of an n-type silicon sample at T = 300 K is to be σ = 10 (2-cm)-¹. What donor impurity concentration is required? What is the electron mobility corresponding to this impurity concentration? (b) A p-type silicon material is required to have a resistivity of p = 0.20 (-cm What acceptor impurity concentra- tion is required and what is the corresponding hole mobility?
Physics
Semiconductors
The required conductivity of an n-type silicon sample at T = 300 K is to be σ = 10 (2-cm)-¹. What donor impurity concentration is required? What is the electron mobility corresponding to this impurity concentration? (b) A p-type silicon material is required to have a resistivity of p = 0.20 (-cm What acceptor impurity concentra- tion is required and what is the corresponding hole mobility?
A copper wire has a resistance of 0.495 2 at 20.0°C, and an iron wire has a resistance of 0.519 2 at the same temperature. At what temperature are their resistances equal? The temperature coefficient of resistivity for copper is 3.90 x 10-3(°C)-1 and for iron it is 5.00 x 10-³(°C)-¹.
Physics
Semiconductors
A copper wire has a resistance of 0.495 2 at 20.0°C, and an iron wire has a resistance of 0.519 2 at the same temperature. At what temperature are their resistances equal? The temperature coefficient of resistivity for copper is 3.90 x 10-3(°C)-1 and for iron it is 5.00 x 10-³(°C)-¹.
Burning of a matchstick is an example of a __
physical change
chemical change
both physical and chemical changes
endothermic change
Physics
Semiconductors
Burning of a matchstick is an example of a __ physical change chemical change both physical and chemical changes endothermic change
Write and present a persuasive speech of at least 600 words (your speech should be about three to four minutes) based on one of the following prompts:
a. Is Thornton Wilder's manipulation of time and use of flashbacks in Our Town effective or ineffective?
Physics
Semiconductors
Write and present a persuasive speech of at least 600 words (your speech should be about three to four minutes) based on one of the following prompts: a. Is Thornton Wilder's manipulation of time and use of flashbacks in Our Town effective or ineffective?
Which best describes an example of an n-type semiconductor?
It uses phosphorus so that electrical conduction is due to the movement of electrons.
It uses phosphorus so that electrical conduction is due to the movement of a positive charge.
It uses gallium so that electrical conduction is due to the movement of electrons.
It uses gallium so that electrical conduction is due to the movement of a positive charge.
Physics
Semiconductors
Which best describes an example of an n-type semiconductor? It uses phosphorus so that electrical conduction is due to the movement of electrons. It uses phosphorus so that electrical conduction is due to the movement of a positive charge. It uses gallium so that electrical conduction is due to the movement of electrons. It uses gallium so that electrical conduction is due to the movement of a positive charge.
Who did NOT benefit from the work of political machines?
Party bosses
Recent immigrants
City governments
Construction companies
Physics
Semiconductors
Who did NOT benefit from the work of political machines? Party bosses Recent immigrants City governments Construction companies
One mole of atoms consists of 6.02 x 10^23 individual atoms.
If 3.00 moles of atoms were spread uniformly over the Earth's surface, how many atoms would there be per square meter? The radius of Earth is 6.38 x 10^3 km.
Express your answer using three significant figures.
Physics
Semiconductors
One mole of atoms consists of 6.02 x 10^23 individual atoms. If 3.00 moles of atoms were spread uniformly over the Earth's surface, how many atoms would there be per square meter? The radius of Earth is 6.38 x 10^3 km. Express your answer using three significant figures.
The saturation current for a junction diode is 18 microamps.
Calculate the resistance of the diode at forward potential differences of 0.20 V when T = 17°C.
Express your answer with the appropriate units.
Calculate the resistance of the diode at reverse potential differences of 0.20 V when T = 17°C.
Express your answer with the appropriate units.
Physics
Semiconductors
The saturation current for a junction diode is 18 microamps. Calculate the resistance of the diode at forward potential differences of 0.20 V when T = 17°C. Express your answer with the appropriate units. Calculate the resistance of the diode at reverse potential differences of 0.20 V when T = 17°C. Express your answer with the appropriate units.
One way to approach Internet search engines and directories effectively and efficiently is to use Boolean operators. Which of the following is not a Boolean operator?
and
or
not
All of the above are Boolean operators.
Physics
Semiconductors
One way to approach Internet search engines and directories effectively and efficiently is to use Boolean operators. Which of the following is not a Boolean operator? and or not All of the above are Boolean operators.
i. In no more than 50 words, explain why doping is essential for imparting specific properties to intrinsic semiconducting material such as Si.

ii.Give two reasons why ion implantation doping is better than diffusion doping.
Physics
Semiconductors
i. In no more than 50 words, explain why doping is essential for imparting specific properties to intrinsic semiconducting material such as Si. ii.Give two reasons why ion implantation doping is better than diffusion doping.
A pure Si sample at 20°C has density 5x10^28. Number of thermally generated electron-hole pairs are 1.5 x 10^16 at this temperature. Now, the pure Si sample is doped with Al atoms at the rate of 1 atom per 10^7 Si atoms, which results increment in conductivity increases at the rate of 5% perºC. Compute the conductivities of pure Si, extrinsic Si and at 34°C.
Physics
Semiconductors
A pure Si sample at 20°C has density 5x10^28. Number of thermally generated electron-hole pairs are 1.5 x 10^16 at this temperature. Now, the pure Si sample is doped with Al atoms at the rate of 1 atom per 10^7 Si atoms, which results increment in conductivity increases at the rate of 5% perºC. Compute the conductivities of pure Si, extrinsic Si and at 34°C.
Design a step-up transformer.
Draw the schematic of your step-up transformer to step-up the voltage from 50 V to 200 V and discuss the following parameters;
a. Np: primary winding turns
b. Ns.: secondary winding turns
c. N: Turns ratio
d. Relate primary and secondary turns ratio to primary and secondary voltages of your designed transformer and verify the results
Physics
Semiconductors
Design a step-up transformer. Draw the schematic of your step-up transformer to step-up the voltage from 50 V to 200 V and discuss the following parameters; a. Np: primary winding turns b. Ns.: secondary winding turns c. N: Turns ratio d. Relate primary and secondary turns ratio to primary and secondary voltages of your designed transformer and verify the results
andA hole in a copper plate has a radius of 5 cm at 20 degree C. When the plate is heated to 200 degree C.
find
a) If the hole increased or decreased?
b) what is the new radius of the hole?
c) the change in the area of the hole.
Physics
Semiconductors
andA hole in a copper plate has a radius of 5 cm at 20 degree C. When the plate is heated to 200 degree C. find a) If the hole increased or decreased? b) what is the new radius of the hole? c) the change in the area of the hole.
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