The resistivity of copper at 20ºC is 1.7 $\times$ 10-8 $\Omega$ · m and the number of electrons per cubic centimeter is 8.47 $\times$ 1022.If you take the average speed of the electrons to be equal to their root-mean-square speed (at T = 300 K)of 1.17 $\times$ 105 m/s,it follows that their mean free path,$\lambda$,must be

A) 1.23 nm B) 1.86 nm C) 2.35 nm D) 2.89 nm E) None of these is correct. A) 1.23 nm B) 1.86 nm C) 2.35 nm D) 2.89 nm E) None of these is correct.

Using the measured mass density of 2.48 g/cm3,and the molar mass of 58.098 g for KF,the equilibrium spacing between the K+ and F- ions is

A) 0.168 nm B) 0.196 nm C) 0.269 nm D) 0.293 nm E) 0.312 nm A) 0.168 nm B) 0.196 nm C) 0.269 nm D) 0.293 nm E) 0.312 nm

A) have little influence on one another. B) have little influence on one another except during their frequent but brief collisions. C) are close together and exert forces on one another that are comparable to the forces that bind atoms into molecules. D) form temporary short-range bonds that continually break and re-form due to the thermal kinetic energy of the molecules. E) are always arranged in a crystalline structure. A) have little influence on one another. B) have little influence on one another except during their frequent but brief collisions. C) are close together and exert forces on one another that are comparable to the forces that bind atoms into molecules. D) form temporary short-range bonds that continually break and re-form due to the thermal kinetic energy of the molecules. E) are always arranged in a crystalline structure.

Exam 38: Solids and the Theory of Conduction

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Use the following to answer the question below: -The probability that an energy state in magnesium 0.05 eV above the Fermi energy is occupied at T = 300 K is

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Which of the following statements is false?

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Use the following to answer the question below: -The probability that an energy state in copper 0.05 eV below the Fermi energy is occupied at T = 300 K is

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An 8-gauge copper wire (diameter = 3.665 mm)carries a current of 40 A.The current density of the wire is

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Question 4

The resistivity of copper at 20ºC is 1.7 $\times$ 10^-8 $\Omega$ · m and the number of electrons per cubic centimeter is 8.47 $\times$ 10²².If you take the average speed of the electrons to be equal to their root-mean-square speed (at T = 300 K)of 1.17 $\times$ 10⁵ m/s,it follows that their mean free path, $\lambda$ ,must be

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Question 5

Use the following to answer the question below: -The probability that an energy state in copper 0.2 eV below the Fermi energy is occupied at T = 300 K is

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Question 6

Using the measured mass density of 2.48 g/cm³,and the molar mass of 58.098 g for KF,the equilibrium spacing between the K⁺ and F^- ions is

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Question 7

If the energy levels are given as E_n = nE₁,by what factor is the total energy of seven fermions greater than seven bosons,both of which are in the ground state?

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Question 8

Molecules in a gas

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Question 9

Reverse biasing of a pn junction tends to

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Question 10

Use the following to answer the question: -The Fermi temperature for aluminum is

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Question 11

Silicon is one of the Group IV semiconductors and has an energy gap of 1.12 eV.Generally only metals have highly shiny surface,yet as shown in the figure,silicon appears to reflect like a metal.This is because

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Question 12

Which of the following expressions correctly describes the dependence of the resistivity $\rho$ on the electronic mass,m_e, the number of conduction electrons n_e,the electronic charge e,the mean electron speed v_av,and the mean free path $\lambda$ ?

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Question 13

Use the following to answer the question below: -At what energy is the Fermi factor equal to 0.1 for magnesium at T = 300 K?

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Question 14

If you increase the temperature of a semiconductor,you can expect to measure

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Question 15

The resistivity of copper at 20ºC is 1.7 $\times$ 10^-8 $\Omega$ · m.You have copper wire whose diameter is 2.00 mm and need a resistance of 1.00 $\Omega$ .How long would a piece of this wire need to be to provide this resistance?

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Question 16

Use the following to answer the question below: -The probability that an energy state in magnesium 0.2 eV above the Fermi energy is occupied at T = 300 K is

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Question 17

Which of the following expressions correctly describes the dependence of the resistivity $\rho$ on the electric field E,the number of conduction electrons n_e,the electronic charge e,and the electron drift velocity v_d?

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Question 18

An 8-gauge copper wire (diameter = 3.665 mm)carries a current of 40 A.The drift velocity of the charge carriers is

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Question 19

A Josephson junction is a junction of

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Question 20

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Exam 38: Solids and the Theory of Conduction

Use the following to answer the question below: -The probability that an energy state in magnesium 0.05 eV above the Fermi energy is occupied at T = 300 K is

Which of the following statements is false?

Use the following to answer the question below: -The probability that an energy state in copper 0.05 eV below the Fermi energy is occupied at T = 300 K is

An 8-gauge copper wire (diameter = 3.665 mm)carries a current of 40 A.The current density of the wire is

Use the following to answer the question below: -The probability that an energy state in copper 0.2 eV below the Fermi energy is occupied at T = 300 K is

Using the measured mass density of 2.48 g/cm3,and the molar mass of 58.098 g for KF,the equilibrium spacing between the K+ and F- ions is

If the energy levels are given as En = nE1,by what factor is the total energy of seven fermions greater than seven bosons,both of which are in the ground state?

Molecules in a gas

Reverse biasing of a pn junction tends to

Use the following to answer the question: -The Fermi temperature for aluminum is

Silicon is one of the Group IV semiconductors and has an energy gap of 1.12 eV.Generally only metals have highly shiny surface,yet as shown in the figure,silicon appears to reflect like a metal.This is because

Which of the following expressions correctly describes the dependence of the resistivity ρ\rhoρ on the electronic mass,me, the number of conduction electrons ne,the electronic charge e,the mean electron speed vav,and the mean free path λ\lambdaλ ?

Use the following to answer the question below: -At what energy is the Fermi factor equal to 0.1 for magnesium at T = 300 K?

If you increase the temperature of a semiconductor,you can expect to measure

The resistivity of copper at 20ºC is 1.7 ×\times× 10-8 Ω\OmegaΩ · m.You have copper wire whose diameter is 2.00 mm and need a resistance of 1.00 Ω\OmegaΩ .How long would a piece of this wire need to be to provide this resistance?

Use the following to answer the question below: -The probability that an energy state in magnesium 0.2 eV above the Fermi energy is occupied at T = 300 K is

Which of the following expressions correctly describes the dependence of the resistivity ρ\rhoρ on the electric field E,the number of conduction electrons ne,the electronic charge e,and the electron drift velocity vd?

An 8-gauge copper wire (diameter = 3.665 mm)carries a current of 40 A.The drift velocity of the charge carriers is

A Josephson junction is a junction of

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Using the measured mass density of 2.48 g/cm³,and the molar mass of 58.098 g for KF,the equilibrium spacing between the K⁺ and F^- ions is

If the energy levels are given as E_n = nE₁,by what factor is the total energy of seven fermions greater than seven bosons,both of which are in the ground state?

Which of the following expressions correctly describes the dependence of the resistivity $\rho$ on the electronic mass,m_e, the number of conduction electrons n_e,the electronic charge e,the mean electron speed v_av,and the mean free path $\lambda$ ?

The resistivity of copper at 20ºC is 1.7 $\times$ 10^-8 $\Omega$ · m.You have copper wire whose diameter is 2.00 mm and need a resistance of 1.00 $\Omega$ .How long would a piece of this wire need to be to provide this resistance?

Which of the following expressions correctly describes the dependence of the resistivity $\rho$ on the electric field E,the number of conduction electrons n_e,the electronic charge e,and the electron drift velocity v_d?