Question 1

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 2

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. nm

Question 3

Who was the first scientist to propose that an object could emit only certain amounts of energy?

Accepted Answer

A)  Planck 
B)  Einstein 
C)  Bohr 
D)  Rydberg 
E)  de Broglie

Question 4

Who proposed a model that successfully explained the photoelectric effect?

Accepted Answer

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

Question 5

Other factors being constant, a heavy object will have a longer de Broglie wavelength than a light object.

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.

Question 7

According to the Rydberg equation, the line with the shortest wavelength in the emission spectrum of atomic hydrogen is predicted to lie at a wavelength (in nm) of

Accepted Answer

A)  91.2 nm. 
B)  1.10 × 10-2 nm. 
C)  1.10 × 102 nm. 
D)  1.10 × 1016 nm. 
E)  None of these choices are correct.

Question 8

Which of the following is a correct set of quantum numbers for an electron in a 5f orbital?

Accepted Answer

A)  n = 5, l = 3, ml = +1 
B)  n = 5, l = 2, ml = +3 
C)  n = 4, l = 3, ml = 0 
D)  n = 4, l = 2, ml = +1 
E)  n = 5, l = 4, ml = 3

Question 9

In the photoelectric effect, a photon with an energy of 5.3 × 10-19 J strikes an electron in a metal. Of this energy, 3.6 × 10-19 J is the minimum energy required for the electron to escape from the metal. The remaining energy appears as kinetic energy of the photoelectron. What is the velocity of the photoelectron, assuming it was initially at rest?

Accepted Answer

A)  3.7 × 1014 m/s 
B)  3.7 × 1011 m/s 
C)  1.9 × 106 m/s 
D)  6.1 × 105 m/s 
E)  1.7 × 10-19 m/s

Question 10

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 11

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

Accepted Answer

A) True 
 B)False

Question 12

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)  four

Question 13

The Rydberg equation, giving the wavelengths of lines in the spectrum of the hydrogen atom, was obtained by assuming that energy is quantized.

Accepted Answer

A) True 
 B)False

Question 14

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, ultraviolet

Question 15

Which scientist first proposed that particles of matter could have wave properties?

Accepted Answer

A)  Einstein 
B)  Planck 
C)  de Broglie 
D)  Compton 
E)  Heisenberg

Question 16

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

Accepted Answer

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

Question 17

Electromagnetic radiation of 500 nm wavelength lies in the __________ region of the spectrum.

Accepted Answer

A)  infrared 
B)  visible 
C)  ultraviolet 
D)  X-ray 
E)   -ray

Question 18

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 J

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)  deflection

Question 20

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)  E

Exam 7: Quantum Theory and Atomic Structure

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.

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?

Who was the first scientist to propose that an object could emit only certain amounts of energy?

Who proposed a model that successfully explained the photoelectric effect?

Other factors being constant, a heavy object will have a longer de Broglie wavelength than a light object.

The size of an atomic orbital is associated with

According to the Rydberg equation, the line with the shortest wavelength in the emission spectrum of atomic hydrogen is predicted to lie at a wavelength (in nm) of

Which of the following is a correct set of quantum numbers for an electron in a 5f orbital?

Excited hydrogen atoms radiate energy in the

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

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?

The Rydberg equation, giving the wavelengths of lines in the spectrum of the hydrogen atom, was obtained by assuming that energy is quantized.

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

Which scientist first proposed that particles of matter could have wave properties?

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

Electromagnetic radiation of 500 nm wavelength lies in the __________ region of the spectrum.

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

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

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