Deck 41: Atomic Physics

Question 1

The normalized wave function for a hydrogen atom in the 1s state is given by ψ(r)= e^-r/α₀ where α₀ is the Bohr radius,which is equal to 5.29 × 10^-11 m.What is the probability of finding the electron at a distance greater than 7.8 α₀ from the proton?

A)2.3 × 10^-5
B)1.2 × 10^-5
C)1.7 × 10^-5
D)4.6 × 10^-5
E)3.5 × 10^-5

Answer 1

2.3 × 10^-5

Question 2

An electron in a hydrogen atom has orbital quantum number l = 7.How many possible values of the magnetic quantum number m_l could it have?

A)6
B)7
C)15
D)33
E)98

Answer 2

15

Question 3

For each value of the principal quantum number n,what are the possible values of the electron spin quantum number m_s? (There may be more than one correct choice.)

A)0
B)+1/2
C)-1/2
D)+3/2
E)-3/2

Answer 3

+1/2
-1/2

Question 4

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ.Which one of the following numbers could be the principal quantum number n of the electron?

A)0
B)1
C)2
D)3
E)4

Question 5

What is the greatest magnitude of the orbital angular momentum L for an electron in a state with principal quantum number n = 5?

A)4.47
B)4.90
C)5
D)5.48

Question 6

If two electrons in an atom have the same energy,then they must have the same four quantum numbers.

Question 7

The binding energy of the hydrogen atom in its ground state is -13.6 eV.What is the energy when it is in the n = 5 state?

A)2.72 eV
B)-2.72 eV
C)0.544 eV
D)-0.544 eV
E)-68 eV

Question 8

If the orbital quantum number is l = 4,which one of the following is a possible value for the principal quantum number n?

A)1
B)2
C)3
D)4
E)8

Question 9

Consider the four quantum numbers of an electron in an atom,n,l,m_l,and m_s.The energy of an electron in an isolated atom depends on

A)n only.
B)n and l only.
C)n,l,and m_l only.
D)l,m_l,and m_s only.
E)all four quantum numbers.

Question 10

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ.What is the orbital quantum number l of the electron?

A)1
B)2
C)3
D)4
E)5

Question 11

An electron in a hydrogen atom is in the n = 7 shell.How many possible values of the orbital quantum number l could it have?

A)6
B)7
C)15
D)33
E)98

Question 12

What is the energy of an incident photon that is just enough to excite a hydrogen atom from its ground state to its n = 4 state?

A)12.75 eV
B)10.20 eV
C)3.40 eV
D)0.85 eV

Question 13

How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10^-19 J, m_h ≈ m_proton = 1.67 × 10^-27 kg)

A)44.2 km/s
B)21.7 km/s
C)66.5 km/s
D)113 km/s
E)51.0 km/s

Question 14

In the ground state,the quantum numbers (n,l,m_l,m_s)for hydrogen are,respectively

A)1,1,1,1.
B)1,0,0,0.
C)1,0,0,± .
D)1,1,1,± .
E)1,1,0,± .

Question 15

An electron in a hydrogen atom has orbital quantum number l = 4.How many possible values of the magnetic quantum number m_l could it have?

A)4
B)10
C)5
D)9
E)3

Question 16

What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom in a collision? (1 eV = 1.60 × 10^-19 J,m_h ≈ m_proton = 1.67 × 10^-27 kg)

A)44.2 km/s
B)21.7 km/s
C)66.5 km/s
D)113 km/s
E)51.0 km/s

Question 17

If an electron has spin quantum number m_s = - ,what is the possible value for the orbital quantum number l of the electron?

A)0
B)1
C)2
D)11
E)All of the above numbers are possible.

Question 18

Which of the following are characteristics of laser light? (There may be more than one correct choice.)

A)It is coherent.
B)It is produced by an inverted population of atoms.
C)It contains a full spectrum of wavelengths.

Question 19

An electron in a hydrogen atom has principal quantum number n = 4.How many possible values of the orbital quantum number l could it have?

A)8
B)9
C)3
D)4
E)10

Question 20

If the principal quantum number of an electron is n = 5,which one of the following is NOT an allowed magnetic quantum number m_l for the electron?

A)0
B)2
C)3
D)4
E)5

Question 21

The only VALID electron state and shell designation among the following is

A)1p,K.
B)2s,K.
C)1s,L.
D)2p,L.
E)3f,M.

Question 22

How many photons per second emerge from a laser of power with wavelength (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

A)6.09 × 10¹⁵ photons/s
B)5.03 × 10¹² photons/s
C)3.07 × 10¹⁵ photons/s
D)3.07 × 10¹³ photons/s

Question 23

A neutral atom has an electron configuration of 1s²2s²2p⁶3s²3p².How many protons does it have in its nucleus?

A)5
B)11
C)14
D)20
E)26

Question 24

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ.Which of the following angles could NOT be the angle between the orbital angular momentum vector of the electron and an arbitrary z-direction?

A)107°
B)90.0°
C)73.2°
D)54.7°
E)0.00°

Question 25

An atom has completely filled inner shells and a single valence electron in an excited p state.The filled inner shells have an orbital momentum equal to zero.What is the magnitude of the orbital angular momentum L of the atom?

A)1.0ħ
B)1.2ħ
C)1.4ħ
D)1.7ħ
E)2.0ħ

Question 26

How many possible sets of quantum numbers (electron states)are there in the 5f subshell?

A)2
B)6
C)8
D)10
E)14

Question 27

What is the correct electronic configuration for the ground state sodium atom,which has 11 electrons?

A)1s¹2s²3p⁶2s²
B)1s²2s¹3p⁶2s²
C)1s¹2s²2p⁶
D)1s²2s²2p⁶3s²
E)1s²2s²2p⁶3s¹

Question 28

A collection of atoms has 20% of the sample in a state above the ground state.If these emit coherent radiation,what is the wavelength of the laser light produced? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

A)210 nm
B)91 nm
C)340 nm
D)34 nm

Question 29

The wavelength of a ruby laser is 694.3 nm.What is the energy difference between the two energy states involved in laser action? (c = 2.9979 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.6022 × 10^-19 J)

A)1.537 eV
B)1.646 eV
C)1.786 eV
D)1.812 eV
E)3.572 eV

Question 30

How many electrons does it take to fill the d subshell?

A)10
B)6
C)14
D)4
E)8

Question 31

What is the correct electronic configuration for ground state carbon,which has 6 electrons?

A)1s²2s²2p²
B)1s¹2p¹
C)1s¹2s²2p¹
D)1s¹2s¹2p¹
E)1s²2s²2p⁴

Question 32

The only INVALID electron state and shell designation among the following is

A)1s,K.
B)2s,L.
C)2d,L.
D)3s,M.
E)3d,M.

Question 33

How many electrons can be found with principal quantum number n = 3 in a suitably heavy atom?

A)18
B)6
C)20
D)9

Question 34

In a ruby laser,an electron jumps from a higher energy level to a lower one.If the energy difference between the two levels is 1.8 eV,what is the wavelength of the emitted photon? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

A)350 nm
B)470 nm
C)650 nm
D)690 nm
E)960 nm

Question 35

An atom has completely filled inner shells and a single valence electron in an excited p state.The filled inner shells have an orbital momentum equal to zero.A magnetic field is applied,defining the z-axis along the field.Which of the following sets of angles are possible angles between the magnetic field and the orbital angular momentum?

A)45°
B)90°
C)45°,90°
D)45°,135°
E)45°,90°,135°

Question 36

What is the electron configuration for ground state Li,which has 3 electrons?

A)1s³
B)1s¹2s²
C)1s²2s¹
D)1s²1p¹
E)1s¹1p²

Question 37

The correct ground state electron configuration of boron,which has 5 electrons,is

A)1s²2s²2p.
B)1s²2s²2p³.
C)1s²1p²2s.
D)1s²2p²3s.
E)1s²2p³.

Question 38

You need 14 W of infrared laser light power with wavelength 1270 nm to bore a hole in a diamond.How many downward atomic transitions per second must occur in the laser if all of them result in light directed onto the diamond? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

A)8.9 × 10¹⁹
B)8.9 × 10¹⁸
C)5.9 × 10¹⁹
D)2.7 × 10¹⁸