Question 1

What is the typical thermal energy of an electron in a solid at room temperature?

Accepted Answer

A)  0.00 
B)  0.0010 eV 
C)  0.025 eV 
D)  0.27 eV 
E)  1.0 eV 
A)  0.00 
B)  0.0010 eV 
C)  0.025 eV 
D)  0.27 eV 
E)  1.0 eV

Question 2

If a solid has a half-filled valence band,which of the following would it be?

Accepted Answer

A)  a conductor 
B)  an insulator 
C)  a semiconductor 
D)  a p-type semiconductor 
E)  an n-type semiconductor 
A)  a conductor 
B)  an insulator 
C)  a semiconductor 
D)  a p-type semiconductor 
E)  an n-type semiconductor

Question 3

What accelerating potential in an electron microscope would give electrons a wavelength 1.00 $\times$ 10-10 m?

Accepted Answer

A)  37.5 V 
B)  75.0 V 
C)  150 V 
D)  300 V 
A)  37.5 V 
B)  75.0 V 
C)  150 V 
D)  300 V

Question 4

The uncertainty principle was formulated by

Accepted Answer

A)  Einstein. 
B)  Bohr. 
C)  Heisenberg. 
D)  Planck. 
E)  Dirac. 
A)  Einstein. 
B)  Bohr. 
C)  Heisenberg. 
D)  Planck. 
E)  Dirac.

Question 5

What is the wavelength of a 0.40 kg object moving at 25 m/s?

Accepted Answer

A)  0.40 kg objects don't have wavelengths 
B)  10 m 
C)  0.10 m 
D)  6.6 $\times$ 10-35 m 
E)  0.53 $\times$ 10-10 m 
A)  0.40 kg objects don't have wavelengths 
B)  10 m 
C)  0.10 m 
D)  6.6 $\times$ 10-35 m 
E)  0.53 $\times$ 10-10 m

Question 6

A particle with non-zero kinetic energy will

Accepted Answer

A)  always have the same wavelength as the same energy photon. 
B)  always have a greater wavelength than the same energy photon. 
C)  always have a shorter wavelength than the same energy photon. 
D)  sometimes have a greater wavelength than the same energy photon. 
E)  sometimes have a shorter wavelength than the same energy photon. 
A)  always have the same wavelength as the same energy photon. 
B)  always have a greater wavelength than the same energy photon. 
C)  always have a shorter wavelength than the same energy photon. 
D)  sometimes have a greater wavelength than the same energy photon. 
E)  sometimes have a shorter wavelength than the same energy photon.

Question 7

In a 3d subshell,what are the possible values for the magnetic quantum number?

Accepted Answer

A)  3 
B)  3,-3 
C)  3,2,1,0 
D)  2,1,0,-1,-2 
E)  2,-2 
A)  3 
B)  3,-3 
C)  3,2,1,0 
D)  2,1,0,-1,-2 
E)  2,-2

Question 8

An alternate version of the uncertainty principle exchanges the uncertainties in position and momentum with uncertainties in __________ and time interval.

Accepted Answer

A)  angular momentum 
B)  charge 
C)  angle 
D)  energy 
E)  wavelength 
A)  angular momentum 
B)  charge 
C)  angle 
D)  energy 
E)  wavelength

Question 9

What is the energy of a photon that has the same wavelength as an electron with energy 1.60 $\times$ 10-15 J?

Accepted Answer

A)  10.0 keV 
B)  101 keV 
C)  55.3 keV 
D)  5.53 keV 
E)  6.77 keV 
A)  10.0 keV 
B)  101 keV 
C)  55.3 keV 
D)  5.53 keV 
E)  6.77 keV

Question 10

An atom has subshells 1s22s22p63s23p64s23d10 in the ground state.What is its atomic number?

Accepted Answer

A)  10 
B)  18 
C)  20 
D)  30 
E)  More information is needed. 
A)  10 
B)  18 
C)  20 
D)  30 
E)  More information is needed.

Question 11

As the principal quantum number for a particle in the infinite square well increases,what happens to the spacing between adjacent energy levels?

Accepted Answer

A)  It decreases 
B)  It stays the same 
C)  It increases 
A)  It decreases 
B)  It stays the same 
C)  It increases

Question 12

How is the circumference,Cn,of the nth orbit in hydrogen and the de Broglie wavelength,$\lambda$n,of the nth orbit related?

Accepted Answer

A)  $\lambda$n = Cn 
B)  n $\lambda$n = Cn 
C)  $\lambda$n/n= Cn 
D)  n2$\lambda$n = Cn 
E)  2$\pi$$\lambda$n = Cn 
A)  $\lambda$n = Cn 
B)  n $\lambda$n = Cn 
C)  $\lambda$n/n= Cn 
D)  n2$\lambda$n = Cn 
E)  2$\pi$$\lambda$n = Cn

Question 13

Using the energy-time version of the uncertainty principle,estimate the uncertainty in energy of a state with lifetime 10-9 s.

Accepted Answer

A)  10-2 eV 
B)  10-7 eV 
C)  10-12 eV 
D)  10-15 eV 
E)  10-18 eV 
A)  10-2 eV 
B)  10-7 eV 
C)  10-12 eV 
D)  10-15 eV 
E)  10-18 eV

Exam 28: Quantum Physics

What is the typical thermal energy of an electron in a solid at room temperature?

If a solid has a half-filled valence band,which of the following would it be?

What accelerating potential in an electron microscope would give electrons a wavelength 1.00 ×\times× 10-10 m?

The uncertainty principle was formulated by

What is the wavelength of a 0.40 kg object moving at 25 m/s?

A particle with non-zero kinetic energy will

In a 3d subshell,what are the possible values for the magnetic quantum number?

An alternate version of the uncertainty principle exchanges the uncertainties in position and momentum with uncertainties in __________ and time interval.

What is the energy of a photon that has the same wavelength as an electron with energy 1.60 ×\times× 10-15 J?

An atom has subshells 1s22s22p63s23p64s23d10 in the ground state.What is its atomic number?

As the principal quantum number for a particle in the infinite square well increases,what happens to the spacing between adjacent energy levels?

How is the circumference,Cn,of the nth orbit in hydrogen and the de Broglie wavelength, λ\lambdaλ n,of the nth orbit related?

Using the energy-time version of the uncertainty principle,estimate the uncertainty in energy of a state with lifetime 10-9 s.

Introduction

Force

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Sound

Temperature and the Ideal Gas

Heat

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Current and Circuits

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Nuclear Physics

Particle Physics

Filters

What accelerating potential in an electron microscope would give electrons a wavelength 1.00 $\times$ 10^-10 m?

What is the energy of a photon that has the same wavelength as an electron with energy 1.60 $\times$ 10^-15 J?

An atom has subshells 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰ in the ground state.What is its atomic number?

How is the circumference,C_n,of the n^th orbit in hydrogen and the de Broglie wavelength, $\lambda$ _n,of the n^th orbit related?

Using the energy-time version of the uncertainty principle,estimate the uncertainty in energy of a state with lifetime 10^-9 s.