Question 1

The group of atoms at the beginning of periods of the periodic table is called:

Accepted Answer

A) alkali metal atoms 
B) rare earth atoms 
C) transition metal atoms 
D) alkaline atoms 
E) noble gas atoms 
A) alkali metal atoms 
B) rare earth atoms 
C) transition metal atoms 
D) alkaline atoms 
E) noble gas atoms

Question 2

The states being filled from the beginning to end of the lanthanide series of atoms are:

Accepted Answer

A) n = 3, ℓ=2 states 
B) n = 4, ℓ=1 states 
C) n = 4, ℓ=2 states 
D) n = 4, ℓ=3 states 
E) n = 5, ℓ=2 states 
A) n = 3, ℓ=2 states 
B) n = 4, ℓ=1 states 
C) n = 4, ℓ=2 states 
D) n = 4, ℓ=3 states 
E) n = 5, ℓ=2 states

Question 3

When a lithium atom is made from a helium atom by adding a proton (and neutron)to the nucleus and an electron outside, the electron goes into an n = 2, ℓ=0 state rather than an n = 1, ℓ=0 state.This is an indication that electrons:

Accepted Answer

A) obey the Pauli exclusion principle 
B) obey the minimum energy principle 
C) undergo the Zeeman effect 
D) are diffracted 
E) and protons are interchangeable 
A) obey the Pauli exclusion principle 
B) obey the minimum energy principle 
C) undergo the Zeeman effect 
D) are diffracted 
E) and protons are interchangeable

Question 4

Suppose the energy required to ionize a neon atom is i, the energy to excite it is e, and its energy due to thermal agitation at room temperature is t.In increasing order, these three energies are:

Accepted Answer

A) i, e, t 
B) t, i, e 
C) e, t, i 
D) i, t, e 
E) t, e, i 
A) i, e, t 
B) t, i, e 
C) e, t, i 
D) i, t, e 
E) t, e, i

Question 5

Hydrogen atoms are in a magnetic field of 2.0 T.What is their magnetic resonance frequency?

Accepted Answer

A) 2.8 x 1010 Hz 
B) 5.6 x 1010 Hz 
C) 1.1 x 1011 Hz 
D) 1.8 x 1011 Hz 
E) 3.5 x 1011 Hz 
A) 2.8 x 1010 Hz 
B) 5.6 x 1010 Hz 
C) 1.1 x 1011 Hz 
D) 1.8 x 1011 Hz 
E) 3.5 x 1011 Hz

Question 6

The figure shows two different orientations of a proton in a magnetic field.Which orientation is at higher energy?

Accepted Answer

A) a 
B) b 
C) Both are at the same energy, and there is no other orientation at higher energy. 
D) Both are at the same energy, but if the spin vector were perpendicular to the magnetic field the energy would be higher. 
E) Both are at the same energy, but if the spin vector were perpendicular to the magnetic field the energy would be lower. 
A) a 
B) b 
C) Both are at the same energy, and there is no other orientation at higher energy. 
D) Both are at the same energy, but if the spin vector were perpendicular to the magnetic field the energy would be higher. 
E) Both are at the same energy, but if the spin vector were perpendicular to the magnetic field the energy would be lower.

Question 7

A laser beam can be sharply focused because it is:

Accepted Answer

A) highly coherent 
B) plane polarized 
C) intense 
D) circularly polarized 
E) highly directional 
A) highly coherent 
B) plane polarized 
C) intense 
D) circularly polarized 
E) highly directional

Question 8

The magnetic quantum number mℓ is most closely associated with what property of the electron in an atom?

Accepted Answer

A) Magnitude of the orbital angular momentum 
B) Energy 
C) z component of the spin angular momentum 
D) z component of the orbital angular momentum 
E) Radius of the orbit 
A) Magnitude of the orbital angular momentum 
B) Energy 
C) z component of the spin angular momentum 
D) z component of the orbital angular momentum 
E) Radius of the orbit

Question 9

The force exerted on a magnetic dipole as it moves with velocity   through a Stern-Gerlach apparatus is:

Accepted Answer

A) proportional to v 
B) proportional to 1/v 
C) zero 
D) proportional to v2 
E) independent of v 
A) proportional to v 
B) proportional to 1/v 
C) zero 
D) proportional to v2 
E) independent of v

Question 10

Characteristic K x-radiation of an element is caused by:

Accepted Answer

A) stoppage of electrons by the nucleus 
B) scattering of the incident radiation with a change of wavelength 
C) ejection of an electron from an outer shell 
D) transition of an electron to the innermost orbit 
E) none of the above 
A) stoppage of electrons by the nucleus 
B) scattering of the incident radiation with a change of wavelength 
C) ejection of an electron from an outer shell 
D) transition of an electron to the innermost orbit 
E) none of the above

Question 11

Radiation with the minimum wavelength as well as the K x-ray lines are detected for a certain target.The energy of the incident electrons is then doubled, with the result that:

Accepted Answer

A) the minimum wavelength increases and the wavelengths of the K lines remain the same 
B) the minimum wavelength decreases and the wavelengths of the K lines remain the same 
C) the minimum wavelength and the wavelengths of the K lines all increase 
D) the minimum wavelength and the wavelengths of the K lines all decrease 
E) the minimum wavelength increases and the wavelengths of the K lines all decrease 
A) the minimum wavelength increases and the wavelengths of the K lines remain the same 
B) the minimum wavelength decreases and the wavelengths of the K lines remain the same 
C) the minimum wavelength and the wavelengths of the K lines all increase 
D) the minimum wavelength and the wavelengths of the K lines all decrease 
E) the minimum wavelength increases and the wavelengths of the K lines all decrease

Question 12

Possible values of the principal quantum number n for an electron in an atom are:

Accepted Answer

A) only 0 and 1 
B) only 0,1,2,...,  $\infty$ 
C) only 0,1,...,  -1 
D) only 1/2 and -1/2 
E) only 1,2,3,..., $\infty$ 
A) only 0 and 1 
B) only 0,1,2,...,  $\infty$ 
C) only 0,1,...,  -1 
D) only 1/2 and -1/2 
E) only 1,2,3,..., $\infty$

Question 13

Electrons are in a two-dimensional square potential energy well with sides of length L.The potential energy is infinite at the sides and zero inside.The single-particle energies are given by   where nx and ny are integers.The number of single-particle states with energy 5(h2/8mL2)is:

Accepted Answer

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

Question 14

Five electrons are in a two-dimensional square potential energy well with sides of length L.The potential energy is infinite at the sides and zero inside.The single-particle energies are given by   where nx and ny are integers.The energy of the first excited state of the system is:

Accepted Answer

A) 13 (h2/8mL2) 
B) 22 (h2/8mL2) 
C) 24 (h2/8mL2) 
D) 25 (h2/8mL2) 
E) 27 (h2/8mL2) 
A) 13 (h2/8mL2) 
B) 22 (h2/8mL2) 
C) 24 (h2/8mL2) 
D) 25 (h2/8mL2) 
E) 27 (h2/8mL2)

Question 15

In connection with x-ray emission the symbol K $\alpha$  refers to:

Accepted Answer

A) an alpha particle radiation 
B) an effect of the dielectric constant on energy levels 
C) x-ray radiation from potassium 
D) x-ray radiation associated with an electron going from n =  $\infty$  to n = 1 
E) x-ray radiation associated with an electron going from n = 2 to n = 1 
A) an alpha particle radiation 
B) an effect of the dielectric constant on energy levels 
C) x-ray radiation from potassium 
D) x-ray radiation associated with an electron going from n =  $\infty$  to n = 1 
E) x-ray radiation associated with an electron going from n = 2 to n = 1

Question 16

Which of the following subshells cannot exist?

Accepted Answer

A) 3p 
B) 2p 
C) 4d 
D) 3d 
E) 2d 
A) 3p 
B) 2p 
C) 4d 
D) 3d 
E) 2d

Question 17

A magnetic dipole   is placed in a strong uniform magnetic field   .The associated force exerted on the dipole is:

Accepted Answer

A) along   
B) along   
C) along   
D) along   
E) zero 
A) along   
B) along   
C) along   
D) along   
E) zero

Question 18

An electron in an L shell of an atom has the principal quantum number:

Accepted Answer

A) n = 0 
B) n = 1 
C) n = 2 
D) n = 3 
E) n =  $\infty$ 
A) n = 0 
B) n = 1 
C) n = 2 
D) n = 3 
E) n =  $\infty$

Question 19

Which of the following is essential for the laser action to occur between two energy levels of an atom?

Accepted Answer

A) the lower level is metastable 
B) there are more atoms in the upper level than in the lower level 
C) there are more atoms in the lower level than in the upper level 
D) the lower level is the ground state 
E) the lasing material is a gas 
A) the lower level is metastable 
B) there are more atoms in the upper level than in the lower level 
C) there are more atoms in the lower level than in the upper level 
D) the lower level is the ground state 
E) the lasing material is a gas

Question 20

No state in an atom can be occupied by more than one electron.This is most closely related to the:

Accepted Answer

A) wave nature of matter 
B) finite value for the speed of light 
C) Bohr magneton 
D) Pauli exclusion principle 
E) the Einstein-de Haas effect 
A) wave nature of matter 
B) finite value for the speed of light 
C) Bohr magneton 
D) Pauli exclusion principle 
E) the Einstein-de Haas effect

Exam 40: All About Atoms

The group of atoms at the beginning of periods of the periodic table is called:

The states being filled from the beginning to end of the lanthanide series of atoms are:

When a lithium atom is made from a helium atom by adding a proton (and neutron)to the nucleus and an electron outside, the electron goes into an n = 2, ℓ=0 state rather than an n = 1, ℓ=0 state.This is an indication that electrons:

Suppose the energy required to ionize a neon atom is i, the energy to excite it is e, and its energy due to thermal agitation at room temperature is t.In increasing order, these three energies are:

Hydrogen atoms are in a magnetic field of 2.0 T.What is their magnetic resonance frequency?

The figure shows two different orientations of a proton in a magnetic field.Which orientation is at higher energy?

A laser beam can be sharply focused because it is:

The magnetic quantum number mℓ is most closely associated with what property of the electron in an atom?

The force exerted on a magnetic dipole as it moves with velocity through a Stern-Gerlach apparatus is:

Characteristic K x-radiation of an element is caused by:

Radiation with the minimum wavelength as well as the K x-ray lines are detected for a certain target.The energy of the incident electrons is then doubled, with the result that:

Possible values of the principal quantum number n for an electron in an atom are:

Electrons are in a two-dimensional square potential energy well with sides of length L.The potential energy is infinite at the sides and zero inside.The single-particle energies are given by where nx and ny are integers.The number of single-particle states with energy 5(h2/8mL2)is:

Five electrons are in a two-dimensional square potential energy well with sides of length L.The potential energy is infinite at the sides and zero inside.The single-particle energies are given by where nx and ny are integers.The energy of the first excited state of the system is:

In connection with x-ray emission the symbol K α\alphaα refers to:

Which of the following subshells cannot exist?

A magnetic dipole is placed in a strong uniform magnetic field .The associated force exerted on the dipole is:

An electron in an L shell of an atom has the principal quantum number:

Which of the following is essential for the laser action to occur between two energy levels of an atom?

No state in an atom can be occupied by more than one electron.This is most closely related to the:

Measurement

Motion Along a Straight Line

Vectors

Motion in Two and Three Dimensions

Force and Motion

Force and Motion

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Fluids

Oscillations

Waves

Waves

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Coulombs Law

Electric Fields

Gauss Law

Electric Potential

Capacitance

Current and Resistance

Circuits

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference 1

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

Conduction of Electricity in Solids

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

Filters

The magnetic quantum number m_ℓis most closely associated with what property of the electron in an atom?

Electrons are in a two-dimensional square potential energy well with sides of length L.The potential energy is infinite at the sides and zero inside.The single-particle energies are given by where n_x and n_y are integers.The number of single-particle states with energy 5(h²/8mL²)is:

Five electrons are in a two-dimensional square potential energy well with sides of length L.The potential energy is infinite at the sides and zero inside.The single-particle energies are given by where n_x and n_y are integers.The energy of the first excited state of the system is:

In connection with x-ray emission the symbol K _$\alpha$ refers to: