Question 1

What is the speed of an electron in m/s if its wavelength is 0.155 nm?

Accepted Answer

The answer of What is the speed of an electron...

Question 2

A photon has an energy of 5.53 × 10-17 J. What is its frequency in s-1?

Accepted Answer

A)   3.66 × 10-50 s-1
B)   1.20 × 10-17 s-1
C)   3.59 × 10-9 s-1
D)   2.78 × 108 s-1
E)   8.35 × 1016 s-1F) C) and D)
G) A) and C)

Question 3

Continuous spectra are characteristic of heated solids.

Accepted Answer

A) True 
 B)False

Question 4

For all the allowed vibration(s)  (wavelength(s) )  of a plucked guitar string, what is the correct relationship between the length of the string, L, and the wavelength, ?

Accepted Answer

A)   L = /2
B)   L = 
C)   L = n/2 where n is a positive integer
D)   L = n where n is a positive integer
E)   L = 1/F) B) and C)
G) C) and E)

Question 5

In the quantum mechanical treatment of the hydrogen atom, the probability of finding an electron at any point is proportional to the wave function F1F1F1S1F1F1F10.

Accepted Answer

A) True 
 B)False

Question 6

The size 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)   the angular momentum and magnetic quantum numbers, together.F) A) and E)
G) A) and B)

Question 7

In the quantum mechanical treatment of the hydrogen atom, the energy depends on the principal quantum number n but not on the values of l or ml.

Accepted Answer

A) True 
 B)False

Question 8

In the quantum mechanical treatment of the hydrogen atom, the functions F1F1F1S1F1F1F10 and F1F1F1S1F1F1F102 both feature prominently. Briefly explain (in principle) how they are obtained and what, if anything, their physical meanings are.

Accepted Answer

The wave function, , is ...

Question 9

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

Accepted Answer

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

Question 10

For potassium metal, the work function  (the minimum energy needed to eject an electron from the metal surface)  is 3.68 × 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. nmF) C) and D)
G) None of the above

Question 11

a. Use the Bohr equation to calculate the energy needed to ionize a hydrogen atom from its ground state.
b. What is the minimum wavelength of a photon needed for it to have the energy needed in (a)?

Accepted Answer

a. 2.18 × ...

Question 12

Electromagnetic radiation can be specified by its wavelength () , its frequency ()  or its period () . The period  is the time it takes one complete wavelength to pass a point in space. Based on this information, what is the mathematical relationship between  and ?

Accepted Answer

A)   ( = 1/) 
B)   ( = ) 
C)   ( = /c) 
D)   c =  x 
E)   ( = c/) F) All of the above
G) A) and D)

Question 13

Consider the following adjectives used to describe types of spectrum: continuous line atomic emission absorption
How many of them are appropriate to describe the spectrum of radiation given off by a black body?

Accepted Answer

A)   none
B)   one
C)   two
D)   three
E)   fourF) C) and D)
G) B) and E)

Question 14

The interference pattern seen when light passes through narrow, closely spaced slits, is due to

Accepted Answer

A)   diffraction.
B)   reflection.
C)   refraction.
D)   dispersion.
E)   deflection.F) B) and E)
G) None of the above

Question 15

The AM station KBOR plays your favorite music from the 20's and 30's at 1290 kHz. Find the wavelength of these waves.

Accepted Answer

A)   4.30 × 10-2 m
B)   0.144 m
C)   6.94 m
D)   232 m
E)   > 103 mF) A) and E)
G) B) and D)

Question 16

A radio wave has a frequency of 8.6 × 108 Hz. What is the energy of one photon of this radiation?

Accepted Answer

A)   7.7 × 10-43 J
B)   2.3 × 10-34 J
C)   5.7 × 10-25 J
D)   1.7 × 10-16 J
E)   > 10-15 JF) A) and B)
G) None of the above

Question 17

In an atom, the square of an electron's wave function

Accepted Answer

A)   becomes zero at the nucleus.
B)   is smallest near the nucleus.
C)   is largest near the nucleus.
D)   may be zero at more than one point.
E)   tends to infinity at large distances from the nucleus.F) A) and C)
G) A) and B)

Question 18

The Rydberg equation is an example of an empirical equation.

Accepted Answer

A) True 
 B)False

Question 19

What is the minimum uncertainty in the position of a neutron if the uncertainty in its speed is 0.0250 m/s?

Accepted Answer

The answer of What is the minimum uncertainty in the...

Question 20

What are the possible values for the following quantum numbers in an atom?
a. n
b. l
c. ml

Accepted Answer

a. n = 1, 2, 3, ...

Exam 7: Quantum Theory and Atomic Structure

Consider the following adjectives used to describe types of spectrum: continuous line atomic emission absorption How many of them are appropriate to describe the spectrum of radiation given off by a black body?

Correct AnswerverifiedShow Answer

What is the minimum uncertainty in the position of a neutron if the uncertainty in its speed is 0.0250 m/s?

Correct AnswerverifiedShow Answer

The Rydberg equation is an example of an empirical equation.

Correct AnswerverifiedShow Answer

In the quantum mechanical treatment of the hydrogen atom, the probability of finding an electron at any point is proportional to the wave function .

Correct AnswerverifiedShow Answer

a. Use the Bohr equation to calculate the energy needed to ionize a hydrogen atom from its ground state. b. What is the minimum wavelength of a photon needed for it to have the energy needed in (a)?

Correct Answerverifieda. 2.18 × ...View AnswerShow Answer

In an atom, the square of an electron's wave function

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In the quantum mechanical treatment of the hydrogen atom, the energy depends on the principal quantum number n but not on the values of l or ml.

Correct AnswerverifiedShow Answer

The interference pattern seen when light passes through narrow, closely spaced slits, is due to

Correct AnswerverifiedShow Answer

A photon has an energy of 5.53 × 10-17 J. What is its frequency in s-1?

Correct AnswerverifiedShow Answer

Continuous spectra are characteristic of heated solids.

Correct AnswerverifiedShow Answer

For all the allowed vibration(s) (wavelength(s) ) of a plucked guitar string, what is the correct relationship between the length of the string, L, and the wavelength, ?

Correct AnswerverifiedShow Answer

The size of an atomic orbital is associated with

Correct AnswerverifiedShow Answer

What is the speed of an electron in m/s if its wavelength is 0.155 nm?

Correct AnswerverifiedShow Answer

The AM station KBOR plays your favorite music from the 20's and 30's at 1290 kHz. Find the wavelength of these waves.

Correct AnswerverifiedShow Answer

A radio wave has a frequency of 8.6 × 108 Hz. What is the energy of one photon of this radiation?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Electromagnetic radiation can be specified by its wavelength () , its frequency () or its period () . The period  is the time it takes one complete wavelength to pass a point in space. Based on this information, what is the mathematical relationship between  and ?

Correct AnswerverifiedShow Answer

In the quantum mechanical treatment of the hydrogen atom, the functions  and 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 ...View AnswerShow Answer

What are the possible values for the following quantum numbers in an atom? a. n b. l c. ml

Correct Answerverifieda. n = 1, 2, 3, ...View AnswerShow Answer

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a. 2.18 × ...
View Answer

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

Correct Answer
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In the quantum mechanical treatment of the hydrogen atom, the energy depends on the principal quantum number n but not on the values of l or m_l.

Correct Answer
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Correct Answer
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A photon has an energy of 5.53 × 10^-17 J. What is its frequency in s^-1?

Correct Answer
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A radio wave has a frequency of 8.6 × 10⁸ Hz. What is the energy of one photon of this radiation?

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

Correct Answer
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The wave function, , is ...
View Answer

What are the possible values for the following quantum numbers in an atom? a. n b. l c. m_l

Correct Answer
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a. n = 1, 2, 3, ...
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