Question 1

If the energy of a photon is 1.32 *10¯18 J, what is its wavelength in nm?

Accepted Answer

A)   1.50 * 10¯7 nm
B)   150. nm
C)   1.99 *1015 nm
D)   1.99 * 1024 nm
E)   None of these choices is correct. B

Question 2

Line spectra are characteristic of atoms in the gas phase.

Accepted Answer

A) True 
 B)False

Question 3

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 m

Question 4

Which scientist first proposed that the electron in the hydrogen atom can have only certain energies?

Accepted Answer

A)   Planck
B)   Einstein
C)   Bohr
D)   Rydberg
E)   Heisenberg

Question 5

Who proposed a model that successfully explained the photoelectric effect?

Accepted Answer

A)   Planck
B)   Einstein
C)   Compton
D)   Rydberg
E)   Bohr B

Question 6

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

Accepted Answer

A)   radio, infrared, ultraviolet, gamma rays
B)   radio, ultraviolet, infrared, gamma rays
C)   gamma rays, radio, ultraviolet, infrared
D)   gamma rays, infrared, radio, ultraviolet
E)   gamma rays, ultraviolet, infrared, radio

Question 7

The de Broglie equation predicts that the wavelength (in m)  of a proton moving at 1000. m/s is:

Accepted Answer

A)   3.96 * 10¯10 m
B)   3.96 * 10¯7 m
C)   2.52 * 106 m
D)   2.52 * 109 m
E)   > 1010 m

Question 8

As the frequency of electromagnetic radiation increases, its wavelength also increases.

Accepted Answer

A) True 
 B)False

Question 9

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 10

The energy of a photon is directly proportional to the wavelength of the radiation.

Accepted Answer

A) True 
 B)False

Question 11

The shape 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 magnetic and spin quantum numbers, together.

Question 12

Infrared radiation from the sun has a wavelength of 6200 nm. Calculate the energy of one photon of that radiation.

Accepted Answer

A)   4.l * l0¯39 J
B)   4.l* l0¯30 J
C)   3.2 *10¯29 J
D)   3.2 * 10¯26 J
E)   between 10¯20 and 10¯19 J

Question 13

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

Accepted Answer

A)   n = 3; l = 1; ml = 2
B)   n = 1; l = 3; ml = 3
C)   n = 3; l = 2; ml = 1
D)   n = 3; l = 1; ml = -1
E)   n = 3; l = 0; ml = 1

Question 14

Which scientist demonstrated that photons transferred momentum during collisions with matter?

Accepted Answer

A)   Bohr
B)   de Broglie
C)   Planck
D)   Compton
E)   Billiard

Question 15

Excited hydrogen atoms radiate energy in the

Accepted Answer

A)   infrared region only.
B)   visible region only.
C)   ultraviolet region only.
D)   visible and ultraviolet regions only.
E)   infrared, visible and ultraviolet regions.

Question 16

A modern compact fluorescent lamp contains 1.4 mg of mercury. If each mercury atom in the lamp were to emit a single photon of wavelength 254 nm, how many joules of energy would be emitted?

Accepted Answer

A)   7.8 * 10-19 J
B)   3.3 J
C)   6.6 *102 J
D)   3.3 * 103 J
E)   4.2 * 1018 J

Question 17

According to the Bohr theory of the hydrogen atom, the minimum energy (in J)  needed to ionize a hydrogen atom from the n = 2 state is

Accepted Answer

A)   2.18 * 10¯18 J
B)   1.64 * 10¯18 J
C)   5.45 *10¯19 J
D)   3.03 * 10¯19 J
E)   None of these choices is correct.

Question 18

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,  λ\lambdaλ ?

Accepted Answer

A)   L =  λ\lambdaλ /2
B)   L =  λ\lambdaλ 
C)   L = n λ\lambdaλ /2 where n is a positive integer
D)   L = n λ\lambdaλ where n is a positive integer
E)   L = 1/ λ\lambdaλ C

Question 19

The energy of an electron in the hydrogen atom is determined by

Accepted Answer

A)   the principal quantum number (n)  only.
B)   the angular momentum quantum number (l)  only.
C)   the principal and angular momentum quantum numbers (n and l) .
D)   the principal and magnetic quantum numbers (n and ml) .
E)   the principal, angular momentum and magnetic quantum numbers.

Question 20

Platinum, which is widely used as a catalyst, has a work function  ϕ\phiϕ  (the minimum energy needed to eject an electron from the metal surface)  of 9.05*10¯19 J. What is the longest wavelength of light which will cause electrons to be emitted?

Accepted Answer

A)   2.196 * 10¯7 m
B)   4.553 * 10¯6 m
C)   5.654 * 102 m
D)   1.370 *1015 m
E)   > 106 m

Exam 7: Quantum Theory and Atomic Structure

If the energy of a photon is 1.32 *10¯18 J, what is its wavelength in nm?

Correct AnswerverifiedB

Line spectra are characteristic of atoms in the gas phase.

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

Which scientist first proposed that the electron in the hydrogen atom can have only certain energies?

Correct AnswerverifiedShow Answer

Who proposed a model that successfully explained the photoelectric effect?

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

The de Broglie equation predicts that the wavelength (in m) of a proton moving at 1000. m/s is:

Correct AnswerverifiedShow Answer

As the frequency of electromagnetic radiation increases, its wavelength also increases.

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 energy of a photon is directly proportional to the wavelength of the radiation.

Correct AnswerverifiedShow Answer

The shape of an atomic orbital is associated with

Correct AnswerverifiedShow Answer

Infrared radiation from the sun has a wavelength of 6200 nm. Calculate the energy of one photon of that radiation.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which scientist demonstrated that photons transferred momentum during collisions with matter?

Correct AnswerverifiedShow Answer

Excited hydrogen atoms radiate energy in the

Correct AnswerverifiedShow Answer

A modern compact fluorescent lamp contains 1.4 mg of mercury. If each mercury atom in the lamp were to emit a single photon of wavelength 254 nm, how many joules of energy would be emitted?

Correct AnswerverifiedShow Answer

According to the Bohr theory of the hydrogen atom, the minimum energy (in J) needed to ionize a hydrogen atom from the n = 2 state is

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, λ\lambdaλ ?

Correct AnswerverifiedC

The energy of an electron in the hydrogen atom is determined by

Correct AnswerverifiedShow Answer

Platinum, which is widely used as a catalyst, has a work function ϕ\phiϕ (the minimum energy needed to eject an electron from the metal surface) of 9.05*10¯19 J. What is the longest wavelength of light which will cause electrons to be emitted?

Correct AnswerverifiedShow Answer

If the energy of a photon is 1.32 *10¯¹⁸ J, what is its wavelength in nm?

Correct Answer
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B

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B

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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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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, $\lambda$ ?

Correct Answer
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C

Correct Answer
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Platinum, which is widely used as a catalyst, has a work function $\phi$ (the minimum energy needed to eject an electron from the metal surface) of 9.05*10¯¹⁹ J. What is the longest wavelength of light which will cause electrons to be emitted?

Correct Answer
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