Question 1

Which of the following electrons will have the smallest de Broglie wavelength?

Accepted Answer

A)  an electron moving 220 m/sec 
B)  an electron moving 20 mi/hr 
C)  an electron moving 75 km/hr 
D)  an electron moving at 25% the speed of light 
E)  an electron at rest with no velocity 
A)  an electron moving 220 m/sec 
B)  an electron moving 20 mi/hr 
C)  an electron moving 75 km/hr 
D)  an electron moving at 25% the speed of light 
E)  an electron at rest with no velocity

Question 2

What is the energy (E, in J) of the photons emitted by an Ar+ laser with a wavelength of $\lambda$ = 488 nm?

Accepted Answer

A)  2.46 * 1018 J 
B)  9.69 *10-23 J 
C)  1.36 *10-36 J 
D)  4.07 *10-19 J 
E)  2.46 * 10-18 J 
A)  2.46 * 1018 J 
B)  9.69 *10-23 J 
C)  1.36 *10-36 J 
D)  4.07 *10-19 J 
E)  2.46 * 10-18 J

Question 3

Consider the radial distribution shown below for an electron in an s atomic orbital where r is the distance of the electron from the nucleus.   
Identify: (1) where the atomic nucleus is located; (2) a radial node; (3) the most probable distance of the electron from the nucleus; and (4) the principle quantum number for this orbital.

Accepted Answer

(1) The nucleus is located at

Question 4

What is meant when two or more orbitals are said to be degenerate?

Accepted Answer

They have

Question 5

What are the principal and angular momentum quantum numbers for a 4f orbital?

Accepted Answer

A)  n = 4, $\ell$ = 2 
B)  n = 4, $\ell$ = 3 
C)  n = 4, $\ell$ = 4 
D)  n = 3, $\ell$ = 4 
E)  n = 4, $\ell$= 1 
A)  n = 4, $\ell$ = 2 
B)  n = 4, $\ell$ = 3 
C)  n = 4, $\ell$ = 4 
D)  n = 3, $\ell$ = 4 
E)  n = 4, $\ell$= 1

Question 6

Which statement A-D about the wave function for a single electron is not correct?

Accepted Answer

A)  A French graduate student named Louis de Broglie first had the idea that an electron should be described as a wave. 
B)  Louis de Broglie postulated that the wavelength of an electron is given in terms of Planck's constant and its momentum, $\lambda$ = h/p. 
C)  The amplitude of a wave function at a particular point in space equals the probability density of finding the electron at that point. 
D)  Wave functions can have nodes, which are points where the amplitude is zero. 
E)  Statements A-D are all correct. 
A)  A French graduate student named Louis de Broglie first had the idea that an electron should be described as a wave. 
B)  Louis de Broglie postulated that the wavelength of an electron is given in terms of Planck's constant and its momentum, $\lambda$ = h/p. 
C)  The amplitude of a wave function at a particular point in space equals the probability density of finding the electron at that point. 
D)  Wave functions can have nodes, which are points where the amplitude is zero. 
E)  Statements A-D are all correct.

Question 7

What is the kinetic energy of the photoelectrons emitted from a sodium surface (  = 2.9 *10-19 J) when it is irradiated by photons with a wavelength of 350 nm?

Accepted Answer

A)  2.9 *10-19 J 
B)  5.7 *10-19 J 
C)  0 J 
D)  2.8 *10-19 J 
E)  3.6 * 10-19 J 
A)  2.9 *10-19 J 
B)  5.7 *10-19 J 
C)  0 J 
D)  2.8 *10-19 J 
E)  3.6 * 10-19 J

Question 8

If cesium, which has a work function of 2.1 eV, is used in a photodetector, what will be the kinetic energy of electrons produced by green light (540 nm) incident on the detector?
(1 eV = 1.60 *10-19 J)

Accepted Answer

Question 9

Based on the following graph, which metal will emit the highest energy photoelectron when a photon with a frequency of 3.9*1014 Hz is incident on the metal?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
A)  a 
B)  b 
C)  c 
D)  d

Question 10

Which of the following atoms has no unpaired electrons?

Accepted Answer

A)  B 
B)  C 
C)  O 
D)  Mg 
E)  Na 
A)  B 
B)  C 
C)  O 
D)  Mg 
E)  Na

Question 11

Indicate which of the following sources produces the lowest energy photons.

Accepted Answer

A)  a radio station with v = 106.7 MHz 
B)  a dentist's X-ray source with $\lambda$ = 100 pm 
C)  the laser in a CD player with $\lambda$= 650 nm 
D)  a microwave oven with v = 6.0 * 1010 Hz 
E)  your cell phone with v = 1.750 GHz 
A)  a radio station with v = 106.7 MHz 
B)  a dentist's X-ray source with $\lambda$ = 100 pm 
C)  the laser in a CD player with $\lambda$= 650 nm 
D)  a microwave oven with v = 6.0 * 1010 Hz 
E)  your cell phone with v = 1.750 GHz

Question 12

Which of the transitions in the hydrogen atom energy-level diagram shown here is not possible?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
A)  a 
B)  b 
C)  c 
D)  d

Question 13

Indicate which metal requires the shortest wavelength photons to eject photoelectrons based on the following graph.

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
A)  a 
B)  b 
C)  c 
D)  d

Question 14

Which combination of quantum numbers is possible for an atom with five orbitals in one subshell?

Accepted Answer

A)  n = 1, $\ell$ = 0 
B)  n = 2, $$\ell$$ = 4 
C)  n = 3, $\ell$ = 2 
D)  n = 4, $\ell$ = 4 
E)  n = 5, $\ell$ = 0 
A)  n = 1, $\ell$ = 0 
B)  n = 2, $$\ell$$ = 4 
C)  n = 3, $\ell$ = 2 
D)  n = 4, $\ell$ = 4 
E)  n = 5, $\ell$ = 0

Question 15

Which of the following sources produces the highest energy photons?

Accepted Answer

A)  a doctor's X-ray source 
B)  the heat lamp in your bathroom 
C)  a microwave oven 
D)  gamma rays from a star 
E)  radio waves from your local station 
A)  a doctor's X-ray source 
B)  the heat lamp in your bathroom 
C)  a microwave oven 
D)  gamma rays from a star 
E)  radio waves from your local station

Question 16

Which arrangement is correct for increasing atomic radius?

Accepted Answer

A)  C < N < F 
B)  Rb < K < Li 
C)  Sc < Ge < Br 
D)  Se < Cu < Ca 
E)  H < He 
A)  C < N < F 
B)  Rb < K < Li 
C)  Sc < Ge < Br 
D)  Se < Cu < Ca 
E)  H < He

Question 17

Which of the following photons has the lowest energy?

Accepted Answer

A)  a photon from a Nd:YAG laser with $\lambda$ = 1,064 nm 
B)  a photon from an Ar+ laser with $\lambda$= 514.5 nm 
C)  a photon from a Kr+ laser with $\lambda$ = 647 nm 
D)  a photon from an ArF laser with $\lambda$ = 193 nm 
E)  a photon from a He-Ne laser with $\lambda$ = 633 nm 
A)  a photon from a Nd:YAG laser with $\lambda$ = 1,064 nm 
B)  a photon from an Ar+ laser with $\lambda$= 514.5 nm 
C)  a photon from a Kr+ laser with $\lambda$ = 647 nm 
D)  a photon from an ArF laser with $\lambda$ = 193 nm 
E)  a photon from a He-Ne laser with $\lambda$ = 633 nm

Question 18

Arrange the following elements in order of increasing size: 15P, 20Ca, 32Ge, 37Rb, 38Sr.

Accepted Answer

P < Ge < C

Question 19

Write the electron configuration of Zn.

Accepted Answer

The answer of Write the electron configuration of Zn....

Question 20

Which of the transitions in the hydrogen atom energy-level diagram shown here requires the longest wavelength photon?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
A)  a 
B)  b 
C)  c 
D)  d

Exam 7: A Quantum Model of Atoms: Waves and Particles

Which of the following electrons will have the smallest de Broglie wavelength?

What is the energy (E, in J) of the photons emitted by an Ar+ laser with a wavelength of λ\lambdaλ = 488 nm?

What is meant when two or more orbitals are said to be degenerate?

What are the principal and angular momentum quantum numbers for a 4f orbital?

Which statement A-D about the wave function for a single electron is not correct?

What is the kinetic energy of the photoelectrons emitted from a sodium surface ( = 2.9 *10-19 J) when it is irradiated by photons with a wavelength of 350 nm?

If cesium, which has a work function of 2.1 eV, is used in a photodetector, what will be the kinetic energy of electrons produced by green light (540 nm) incident on the detector? (1 eV = 1.60 *10-19 J)

Based on the following graph, which metal will emit the highest energy photoelectron when a photon with a frequency of 3.9*1014 Hz is incident on the metal?

Which of the following atoms has no unpaired electrons?

Indicate which of the following sources produces the lowest energy photons.

Which of the transitions in the hydrogen atom energy-level diagram shown here is not possible?

Indicate which metal requires the shortest wavelength photons to eject photoelectrons based on the following graph.

Which combination of quantum numbers is possible for an atom with five orbitals in one subshell?

Which of the following sources produces the highest energy photons?

Which arrangement is correct for increasing atomic radius?

Which of the following photons has the lowest energy?

Arrange the following elements in order of increasing size: 15P, 20Ca, 32Ge, 37Rb, 38Sr.

Write the electron configuration of Zn.

Which of the transitions in the hydrogen atom energy-level diagram shown here requires the longest wavelength photon?

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: the Air We Breathe

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Molecular Geometry: Shape Determines Function

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Structures and Applications

Organic Chemistry: Fuels, Pharmaceuticals, Materials, and Life

Chemical Kinetics: Reactions in the Air We Breathe

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acid-Base and Solubility Equilibria: Reactions in Soil and Water

Metal Ions: Colorful and Essential

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: the Quest for Clean Energy

Biochemistry: the Compounds of Life

Nuclear Chemistry: Applications to Energy and Medicine

Life and the Periodic Table

Filters

What is the energy (E, in J) of the photons emitted by an Ar⁺ laser with a wavelength of $\lambda$ = 488 nm?

What is the kinetic energy of the photoelectrons emitted from a sodium surface ( = 2.9 *10^-¹⁹ J) when it is irradiated by photons with a wavelength of 350 nm?

If cesium, which has a work function of 2.1 eV, is used in a photodetector, what will be the kinetic energy of electrons produced by green light (540 nm) incident on the detector? (1 eV = 1.60 *10^-¹⁹ J)

Based on the following graph, which metal will emit the highest energy photoelectron when a photon with a frequency of 3.9*10¹⁴ Hz is incident on the metal?

Arrange the following elements in order of increasing size: ₁₅P, ₂₀Ca, ₃₂Ge, ₃₇Rb, ₃₈Sr.