Question 1

What is the longest possible wavelength that a hydrogen atom will emit?

Accepted Answer

A)  91 nm
B)  122 nm
C)  365 nm
D)  1459 nm
E)  There is no limit.F) A) and B)
G) A) and C)

Question 2

The energy contained in a length of a 3.00-mW laser beam in vacuum is 1.80 * 10-10 J.What is the length of the beam?

Accepted Answer

A)  2.0 m
B)  24 m
C)  15 m
D)  18 mE) A) and B)
F) A) and C)

Question 3

What are the quantum numbers n and l for a hydrogen atom with E = - (13.6/16) eV and L =  6 \sqrt66​  ?

Accepted Answer

A)  n = 4,l = 2
B)  n = 4,l = 6
C)  n = 3,l = 3
D)  n = 3,l = 6 E) B) and C)
F) A) and C)

Question 4

What is the magnitude (in N) of the electric force between a proton and a (lowest energy) n = 1 electron in a hydrogen atom?

Accepted Answer

A)  8.2 * 10-8
B)  8.2 * 108
C)  8.2 * 10-12
D)  8.2 * 10-4
E)  8.2 * 104F) B) and C)
G) C) and D)

Question 5

A collection of hydrogen atoms has been placed into the n = 4 excited state.Which of the following wavelengths of photons will NOT be emitted by the hydrogen atoms as they decay back to the ground state?

Accepted Answer

A)  97 nm
B)  490 nm
C)  970 nm
D)  1900 nmE) C) and D)
F) A) and C)

Question 6

The frequency of the 14 Hz B) 3.22 * 1015 Hz C) 1.21 * 1015 Hz D) 2.25 * 1015 Hz " class="answers-bank-image d-inline" rel="preload" > line of the Lyman group for the hydrogen spectrum is

Accepted Answer

A)  9.88 * 1014 Hz
B)  3.22 * 1015 Hz
C)  1.21 * 1015 Hz
D)  2.25 * 1015 HzE) A) and B)
F) C) and D)

Question 7

Positronium consists of a bound state of an electron and a positron.A positron is exactly the same as an electron,except it has a charge of +e instead of -e.In the classical model,both particles orbit a point midway between them.The reduced mass of positronium is equal to

Accepted Answer

A)  the mass of an electron.
B)  the mass of an electron squared.
C)  the square root of the mass of an electron.
D)  None are correct.E) A) and D)
F) C) and D)

Question 8

What is the wavelength of the photon emitted by a He+ when the electron jumps from the n = 7 to the n = 4 state?

Accepted Answer

A)  8.8  μ\muμ m
B)  3.4  μ\muμ m
C)  4.4  μ\muμ m
D)  896 nm
E)  542 nm F) A) and E)
G) C) and E)

Question 9

If the period of rotation of electron in the Bohr hydrogen atom is 4.10 fs,which Bohr orbit does the electron occupy?

Accepted Answer

A)  first
B)  second
C)  third
D)  fourth
E)  fifthF) C) and D)
G) A) and B)

Question 10

A hydrogen atom relaxes to a lower energy state by emitting a 2.55 eV photon.What is the lower energy state?

Accepted Answer

A)  n = 1
B)  n = 2
C)  n = 3
D)  n = 4
E)  n = 5F) C) and E)
G) B) and D)

Question 11

A 5.0 UV laser emits light that has a wavelength 350 nm.If 1.23 * 1018 photons are emitted in a pulse,what is the duration of the pulse?

Accepted Answer

A)  140 ns
B)  89 ns
C)  54 ns
D)  110 ns
E)  10 nsF) B) and E)
G) All of the above

Question 12

The frequency of the 14 Hz B) 7.33 * 1014 Hz C) 9.05 * 1014 Hz D) 8.54 * 1014 Hz " class="answers-bank-image d-inline" rel="preload" > line of the Balmer group for the hydrogen spectrum is

Accepted Answer

A)  6.91 * 1014 Hz
B)  7.33 * 1014 Hz
C)  9.05 * 1014 Hz
D)  8.54 * 1014 HzE) C) and D)
F) B) and C)

Question 13

A hydrogen atom is in a quantum state with principal quantum number n = 2.The atom absorbs a photon with a wavelength of 660 nm.Determine the maximum possible orbital angular momentum of the electron after absorption.

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and C)
G) A) and E)

Question 14

The electron in a singly ionized helium atom,which consists of two protons,two neutrons and only one electron,makes a transition from the n = 2 state to the n = 1 state,emitting a single photon in the process.What is the energy of this photon?

Accepted Answer

A)  3.40 eV
B)  10.2 eV
C)  13.6 eV
D)  None are correct.E) C) and D)
F) B) and D)

Question 15

An excited hydrogen atom emits a photon with an energy of 0.661 eV.What was the final state of the hydrogen atom after emitting the photon?

Accepted Answer

A)  n = 1
B)  n = 2
C)  n = 3
D)  n = 4
E)  n = 5F) All of the above
G) A) and B)

Question 16

What is the angular momentum of the orbiting electron in a hydrogen atom with quantum number of 45?

Accepted Answer

A)  0.4 * 10-31 kg m2/s
B)  1.6 * 10-31 kg m2/s
C)  2.3 * 10-33 kg m2/s
D)  4.7 * 10-33 kg m2/sE) A) and C)
F) A) and D)

Question 17

In the Bohr model of hydrogen,as the principle quantum number n increases,

Accepted Answer

A)  the total energy increases and the kinetic energy decreases.
B)  the potential energy increases and the speed decreases.
C)  the orbital radius increases.
D)  All are correct.E) B) and D)
F) B) and C)

Question 18

The Pfund series results from emission/absorption of photons due to transitions of electrons in a hydrogen to/from the n=5 energy level from/to higher energy levels.What is the longest wavelength photon emitted in the Pfund series?

Accepted Answer

A)  658 nm
B)  2.29 µm
C)  2.74 µm
D)  7.47 µm
E)  12.4 µmF) A) and E)
G) A) and C)

Question 19

The energy contained in laser beam of length 2.00 m that moves through vacuum is 1.80 * 10-10 J.What is the power of the laser?

Accepted Answer

A)  3.0 mW
B)  12 mW
C)  23 mW
D)  27 mWE) B) and C)
F) All of the above

Question 20

How many electrons are allowed to inhabit the M-shell of an atom?

Accepted Answer

A)  18
B)  10
C)  8
D)  32
E)  14F) All of the above
G) C) and D)

Exam 38: Atomic Physics

An excited hydrogen atom emits a photon with an energy of 0.661 eV.What was the final state of the hydrogen atom after emitting the photon?

Correct AnswerverifiedShow Answer

A hydrogen atom is in a quantum state with principal quantum number n = 2.The atom absorbs a photon with a wavelength of 660 nm.Determine the maximum possible orbital angular momentum of the electron after absorption.

Correct AnswerverifiedShow Answer

What is the longest possible wavelength that a hydrogen atom will emit?

Correct AnswerverifiedShow Answer

What are the quantum numbers n and l for a hydrogen atom with E = - (13.6/16) eV and L = 6 \sqrt66​ ?

Correct AnswerverifiedShow Answer

A hydrogen atom relaxes to a lower energy state by emitting a 2.55 eV photon.What is the lower energy state?

Correct AnswerverifiedShow Answer

What is the wavelength of the photon emitted by a He+ when the electron jumps from the n = 7 to the n = 4 state?

Correct AnswerverifiedShow Answer

In the Bohr model of hydrogen,as the principle quantum number n increases,

Correct AnswerverifiedShow Answer

The energy contained in a length of a 3.00-mW laser beam in vacuum is 1.80 * 10-10 J.What is the length of the beam?

Correct AnswerverifiedShow Answer

The electron in a singly ionized helium atom,which consists of two protons,two neutrons and only one electron,makes a transition from the n = 2 state to the n = 1 state,emitting a single photon in the process.What is the energy of this photon?

Correct AnswerverifiedShow Answer

If the period of rotation of electron in the Bohr hydrogen atom is 4.10 fs,which Bohr orbit does the electron occupy?

Correct AnswerverifiedShow Answer

What is the magnitude (in N) of the electric force between a proton and a (lowest energy) n = 1 electron in a hydrogen atom?

Correct AnswerverifiedShow Answer

The energy contained in laser beam of length 2.00 m that moves through vacuum is 1.80 * 10-10 J.What is the power of the laser?

Correct AnswerverifiedShow Answer

The frequency of the line of the Lyman group for the hydrogen spectrum is

Correct AnswerverifiedShow Answer

The Pfund series results from emission/absorption of photons due to transitions of electrons in a hydrogen to/from the n=5 energy level from/to higher energy levels.What is the longest wavelength photon emitted in the Pfund series?

Correct AnswerverifiedShow Answer

Positronium consists of a bound state of an electron and a positron.A positron is exactly the same as an electron,except it has a charge of +e instead of -e.In the classical model,both particles orbit a point midway between them.The reduced mass of positronium is equal to

Correct AnswerverifiedShow Answer

A 5.0 UV laser emits light that has a wavelength 350 nm.If 1.23 * 1018 photons are emitted in a pulse,what is the duration of the pulse?

Correct AnswerverifiedShow Answer

A collection of hydrogen atoms has been placed into the n = 4 excited state.Which of the following wavelengths of photons will NOT be emitted by the hydrogen atoms as they decay back to the ground state?

Correct AnswerverifiedShow Answer

How many electrons are allowed to inhabit the M-shell of an atom?

Correct AnswerverifiedShow Answer

What is the angular momentum of the orbiting electron in a hydrogen atom with quantum number of 45?

Correct AnswerverifiedShow Answer

The frequency of the line of the Balmer group for the hydrogen spectrum is

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What are the quantum numbers n and l for a hydrogen atom with E = - (13.6/16) eV and L = $\sqrt6$ $What are the quantum numbers n and l for a hydrogen atom with E = - (13.6/16) eV and L = \sqrt6 ? A) n = 4,l = 2 B) n = 4,l = 6 C) n = 3,l = 3 D) n = 3,l = 6$ ?

Correct Answer
verified

Correct Answer
verified

What is the wavelength of the photon emitted by a He⁺ when the electron jumps from the n = 7 to the n = 4 state?

Correct Answer
verified

Correct Answer
verified

The energy contained in a length of a 3.00-mW laser beam in vacuum is 1.80 * 10^-10 J.What is the length of the beam?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The energy contained in laser beam of length 2.00 m that moves through vacuum is 1.80 * 10^-10 J.What is the power of the laser?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A 5.0 UV laser emits light that has a wavelength 350 nm.If 1.23 * 10¹⁸ photons are emitted in a pulse,what is the duration of the pulse?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified