Question 1

In the quantum mechanical treatment of the hydrogen atom,the functions $\varPsi$ and $\varPsi$2 both feature prominently.Briefly explain (in principle)how they are obtained and what,if anything,their physical meanings are.

Accepted Answer

The wave function,<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30">,is a solution to the ...

Question 2

For potassium metal,the work function  ϕ\phiϕ  (the minimum energy needed to eject an electron from the metal surface) is 3.68  ×	imes×  10-19 J.Which is the longest wavelength of the following which could excite photoelectrons?

Accepted Answer

A)  550.nm
B)  500.nm
C)  450.nm
D)  400.nm
E)  350.nm F) A) and E)
G) D) and E)

Question 3

For the following equations,
a.name the scientist to whom the equation is attributed.
b.in not more than three lines,explain clearly what the equation means or represents.

Accepted Answer

1)a.Planck
b.A black body can only emit ...

Question 4

In the Rydberg equation,for a fixed value of n1,the longest wavelength line has n2 = $\infty$

Accepted Answer

A) True 
 B)False

Question 5

The Rydberg equation is an example of an empirical equation.

Accepted Answer

A) True 
 B)False  True

Question 6

Who proposed a model that successfully explained the photoelectric effect?

Accepted Answer

A)  Planck
B)  Einstein
C)  Compton
D)  Rydberg
E)  BohrF) D) and E)
G) B) and D)

Question 7

In the quantum mechanical treatment of the hydrogen atom,which one of the following combinations of quantum numbers is not allowed?

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) A) and C)
G) A) and B)

Question 8

In not more than three lines for each answer,briefly outline one important scientific contribution of each of the following.
a.Planck
b.de Broglie
c.Heisenberg

Accepted Answer

a.Planck is responsible for first propos...

Question 9

The Bohr theory of the hydrogen atom predicts the energy difference (in J) between the n = 3 and the n = 5 state to be

Accepted Answer

A)  8.72  ×	imes×  10-20 J
B)  1.36  ×	imes×  10-19 J
C)  2.42  ×	imes×  10-19 J
D)  1.55  ×	imes×  10-19 J
E)  1.09  ×	imes×  10-18 J F) All of the above
G) A) and C)

Question 10

Who proposed the principle which states that one cannot simultaneously know the exact position and velocity of a particle?

Accepted Answer

A)  Einstein
B)  Planck
C)  Heisenberg
D)  Compton
E)  de BroglieF) A) and E)
G) A) and B)

Question 11

Continuous spectra are characteristic of molecules in the gas phase.

Accepted Answer

A) True 
 B)False

Question 12

Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to greatest energy.

Accepted Answer

A)  radio,visible,infrared,ultraviolet
B)  infrared,visible,ultraviolet,microwave
C)  visible,ultraviolet,infrared,gamma rays
D)  X-radiation,visible,infrared,microwave
E)  microwave,infrared,visible,ultravioletF) B) and D)
G) D) and E)

Question 13

Which of the following is a correct set of quantum numbers for an electron in a 3d orbital?

Accepted Answer

A)  n = 3,l = 0,ml = -1
B)  n = 3,l = 1,ml = +3
C)  n = 3,l = 2,ml = 3
D)  n = 3,l = 3,ml = +2
E)  n = 3,l = 2,ml = -2F) A) and C)
G) B) and D)

Question 14

The orientation in space of an atomic orbital is associated with

Accepted Answer

A)  the principal quantum number (n) .
B)  the angular momentum quantum number (l) .
C)  the magnetic quantum number (ml) .
D)  the spin quantum number (ms) .
E)  None of these choices is correct.F) B) and C)
G) A) and C)

Question 15

Green light has a wavelength of 5200 Å.Calculate the energy of one photon of green light.

Accepted Answer

A)  3.4  ×	imes×  10-40 J
B)  3.4  ×	imes×  10-30 J
C)  3.8  ×	imes×  10-29 J
D)  3.4  ×	imes×  10-27 J
E)  3.8  ×	imes×  10-19 J F) D) and E)
G) C) and D) E

Question 16

Which one of the following sets of quantum numbers can correctly represent a 3p orbital?

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) B) and E)
G) A) and B)

Question 17

Atomic orbitals developed using quantum mechanics

Accepted Answer

A)  describe regions of space in which one is most likely to find an electron.
B)  describe exact paths for electron motion.
C)  give a description of the atomic structure which is essentially the same as the Bohr model.
D)  allow scientists to calculate an exact volume for the hydrogen atom.
E)  are in conflict with the Heisenberg Uncertainty Principle.F) A) and B)
G) A) and C)

Question 18

a.Calculate the momentum of a photon of green light,wavelength 515 nm.
b.If this photon is traveling in a vacuum,what is its "mass"?

Accepted Answer

a.1.29

10^-27

Question 19

Which word best describes the phenomenon which gives rise to a rainbow?

Accepted Answer

A)  reflection
B)  dispersion
C)  diffraction
D)  interference
E)  deflectionF) C) and E)
G) A) and D) B

Question 20

A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s.What is his wavelength at this speed if his mass is 84.5 kg?

Accepted Answer

A)  7.29  ×	imes×  10-37 m
B)  3.26  ×	imes×  10-37 m
C)  5.08  ×	imes×  10-30 m
D)  1.34  ×	imes×  10-30 m
E)  None of these choices is correct. F) A) and D)
G) None of the above

Exam 7: Quantum Theory and Atomic Structure

In the quantum mechanical treatment of the hydrogen atom,the functions Ψ\varPsiΨ and Ψ\varPsiΨ 2 both feature prominently.Briefly explain (in principle)how they are obtained and what,if anything,their physical meanings are.

Correct AnswerverifiedThe wave function,,is a solution to the ...View AnswerShow Answer

For potassium metal,the work function ϕ\phiϕ (the minimum energy needed to eject an electron from the metal surface) is 3.68 ×\times× 10-19 J.Which is the longest wavelength of the following which could excite photoelectrons?

Correct AnswerverifiedShow Answer

For the following equations, a.name the scientist to whom the equation is attributed. b.in not more than three lines,explain clearly what the equation means or represents.

Correct Answerverified1)a.Planckb.A black body can only emit ...View AnswerShow Answer

In the Rydberg equation,for a fixed value of n1,the longest wavelength line has n2 = ∞\infty∞

Correct AnswerverifiedShow Answer

The Rydberg equation is an example of an empirical equation.

Correct AnswerverifiedTrue

Who proposed a model that successfully explained the photoelectric effect?

Correct AnswerverifiedShow Answer

In the quantum mechanical treatment of the hydrogen atom,which one of the following combinations of quantum numbers is not allowed?

Correct AnswerverifiedShow Answer

In not more than three lines for each answer,briefly outline one important scientific contribution of each of the following. a.Planck b.de Broglie c.Heisenberg

Correct Answerverifieda.Planck is responsible for first propos...View AnswerShow Answer

The Bohr theory of the hydrogen atom predicts the energy difference (in J) between the n = 3 and the n = 5 state to be

Correct AnswerverifiedShow Answer

Who proposed the principle which states that one cannot simultaneously know the exact position and velocity of a particle?

Correct AnswerverifiedShow Answer

Continuous spectra are characteristic of molecules in the gas phase.

Correct AnswerverifiedShow Answer

Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to greatest energy.

Correct AnswerverifiedShow Answer

Which of the following is a correct set of quantum numbers for an electron in a 3d orbital?

Correct AnswerverifiedShow Answer

The orientation in space of an atomic orbital is associated with

Correct AnswerverifiedShow Answer

Green light has a wavelength of 5200 Å.Calculate the energy of one photon of green light.

Correct AnswerverifiedE

Which one of the following sets of quantum numbers can correctly represent a 3p orbital?

Correct AnswerverifiedShow Answer

Atomic orbitals developed using quantum mechanics

Correct AnswerverifiedShow Answer

a.Calculate the momentum of a photon of green light,wavelength 515 nm. b.If this photon is traveling in a vacuum,what is its "mass"?

Correct Answerverifieda.1.29 10-27View AnswerShow Answer

Which word best describes the phenomenon which gives rise to a rainbow?

Correct AnswerverifiedB

A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s.What is his wavelength at this speed if his mass is 84.5 kg?

Correct AnswerverifiedShow Answer

In the quantum mechanical treatment of the hydrogen atom,the functions $\varPsi$ and $\varPsi$ ² both feature prominently.Briefly explain (in principle)how they are obtained and what,if anything,their physical meanings are.

Correct Answer
verified
The wave function,,is a solution to the ...
View Answer

For potassium metal,the work function $\phi$ (the minimum energy needed to eject an electron from the metal surface) is 3.68 $\times$ 10^-19 J.Which is the longest wavelength of the following which could excite photoelectrons?

Correct Answer
verified

Correct Answer
verified
1)a.Planck
b.A black body can only emit ...
View Answer

In the Rydberg equation,for a fixed value of n₁,the longest wavelength line has n₂ = $\infty$

Correct Answer
verified

Correct Answer
verified
True

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a.Planck is responsible for first propos...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a.1.29 10^{-27View Answer}

Correct Answer
verified
B

Correct Answer
verified