1. The Quantum-Mechanical
Clicker Questions
Chapter 7
The Quantum-Mechanical
Model of the Atom
Allison Soult
University of Kentucky

2. Determine the wavelength (in nm) of an X-ray with a frequency of 4
Determine the wavelength (in nm) of an X-ray with a frequency of 4.2 × 1018 Hz.
7.1 × 10–11
7.1 × 10–2
1.3 × 1027
1.4 × 1010
7.1 × 10–18
Answer: b

3. Determine the wavelength (in nm) of an X-ray with a frequency of 4
Determine the wavelength (in nm) of an X-ray with a frequency of 4.2 × 1018 Hz.
7.1 × 10–11
7.1 × 10–2
1.3 × 1027
1.4 × 1010
7.1 × 10–18
Answer: b

4. Which of the following statements is NOT true?
Energy increases as the wavelength decreases.
Energy increases as the frequency increases.
Frequency increases as the wavelength decreases.
All of the statements are true.
Answer: d

5. Which of the following statements is NOT true?
Energy increases as the wavelength decreases.
Energy increases as the frequency increases.
Frequency increases as the wavelength decreases.
All of the statements are true.
Answer: d

6. A second electron is ejected. The ejected electron has kinetic energy.
A particle has more than enough energy to eject an electron from a metal’s surface. What happens to the excess energy?
A second electron is ejected.
The ejected electron has kinetic energy.
The energy is reflected back to the source.
The bombarding particle retains the excess energy.
The bombarding particle embeds into the surface.
Answer: b

7. A second electron is ejected. The ejected electron has kinetic energy.
A particle has more than enough energy to eject an electron from a metal’s surface. What happens to the excess energy?
A second electron is ejected.
The ejected electron has kinetic energy.
The energy is reflected back to the source.
The bombarding particle retains the excess energy.
The bombarding particle embeds into the surface.
Answer: b

8. What is the wavelength of a particle that has an energy of 4
What is the wavelength of a particle that has an energy of 4.41 × 10–19 J?
441 nm
450 nm
227 nm
222 nm
199 nm
Answer: b

9. What is the wavelength of a particle that has an energy of 4
What is the wavelength of a particle that has an energy of 4.41 × 10–19 J?
441 nm
450 nm
227 nm
222 nm
199 nm
Answer: b

10. What is the frequency (Hz) of an infrared light that emits 24
What is the frequency (Hz) of an infrared light that emits 24.5 kJ/mol of energy?
3.70 × 1034
6.14 × 1013
4.92 × 1019
8.17 × 10–8
2.70 × 10–35
Answer: b

11. What is the frequency (Hz) of an infrared light that emits 24
What is the frequency (Hz) of an infrared light that emits 24.5 kJ/mol of energy?
3.70 × 1034
6.14 × 1013
4.92 × 1019
8.17 × 10–8
2.70 × 10–35
Answer: b

12. Ultraviolet light emits a total of 2
Ultraviolet light emits a total of 2.5 × 10–17 J of light at a wavelength of 9.8 × 10–7 m. How many photons does this correspond to? 1 10 25
100
125
Answer: e

13. Ultraviolet light emits a total of 2
Ultraviolet light emits a total of 2.5 × 10–17 J of light at a wavelength of 9.8 × 10–7 m. How many photons does this correspond to? 1 10 25
100
125
Answer: e

14. A major league pitcher throws a 148. 8 g baseball at a speed of 92
A major league pitcher throws a g baseball at a speed of 92.5 mph (41.4 m/s). What is the de Broglie wavelength of the baseball in meters?
4.81 × 10–38
4.81 × 10–41
1.08 × 10–34
1.08 × 10–37
1.08 × 10–40
Answer: c

15. A major league pitcher throws a 148. 8 g baseball at a speed of 92
A major league pitcher throws a g baseball at a speed of 92.5 mph (41.4 m/s). What is the de Broglie wavelength of the baseball in meters?
4.81 × 10–38
4.81 × 10–41
1.08 × 10–34
1.08 × 10–37
1.08 × 10–40
Answer: c

16. The de Broglie wavelength of a 455 kg car is found to be 5
The de Broglie wavelength of a 455 kg car is found to be 5.43 × 10–47 nm. Calculate the speed (m/s) of the car.
26.8 m/s
37.3 m/s
2.68 × 10–8 m/s
3.73 × 107 m/s
3.00 × 108 m/s
Answer: a

17. The de Broglie wavelength of a 455 kg car is found to be 5
The de Broglie wavelength of a 455 kg car is found to be 5.43 × 10–47 nm. Calculate the speed (m/s) of the car.
26.8 m/s
37.3 m/s
2.68 × 10–8 m/s
3.73 × 107 m/s
3.00 × 108 m/s
Answer: a

18. How many orbitals have n = 3 and ml = –1?2 3 4 5
Answer: c

19. How many orbitals have n = 3 and ml = –1?2 3 4 5
Answer: c

20. An electron in a hydrogen atom in the n = 6 energy level emits 109
An electron in a hydrogen atom in the n = 6 energy level emits kJ/mol of energy in a transition to a lower energy level. To what energy level does the electron fall? 1 2 3 4 5
Answer: c

21. An electron in a hydrogen atom in the n = 6 energy level emits 109
An electron in a hydrogen atom in the n = 6 energy level emits kJ/mol of energy in a transition to a lower energy level. To what energy level does the electron fall? 1 2 3 4 5
Answer: c

22. Which of the following transitions for an electron in a hydrogen atom would release the largest quantum of energy?
n = 3 → n = 1
n = 4 → n = 3
n = 1 → n = 4
n = 2 → n = 1
Answer: a

23. Which of the following transitions for an electron in a hydrogen atom would release the largest quantum of energy?
n = 3 → n = 1
n = 4 → n = 3
n = 1 → n = 4
n = 2 → n = 1
Answer: a

24. Determine the wavelength (nm) of light absorbed when an electron in a hydrogen atom transitions from the n = 3 to the n = 5 energy level.
434 nm
656 nm
684 nm
780 nm
1280 nm
Answer: e

25. Determine the wavelength (nm) of light absorbed when an electron in a hydrogen atom transitions from the n = 3 to the n = 5 energy level.
434 nm
656 nm
684 nm
780 nm
1280 nm
Answer: e

26. Which of the following is NOT an allowed set of quantum numbers?
n = 4 l = 3 ml = 3
n = 1 l = 0 ml = 0
n = 5 l = 4 ml = –2
n = 2 l = 1 ml = 0
n = 3 l = 3 ml = –2
Answer: e

27. Which of the following is NOT an allowed set of quantum numbers?
n = 4 l = 3 ml = 3
n = 1 l = 0 ml = 0
n = 5 l = 4 ml = –2
n = 2 l = 1 ml = 0
n = 3 l = 3 ml = –2
Answer: e

28. ml must be greater than or equal to l.
What is wrong with the following set of quantum numbers? n = 2, l = 2, ml = 0, ms = +1/2
ml must be greater than or equal to l.
l must be greater than or equal to n.
l has a maximum value of n–1.
ms must be 0 or 1.
This is an allowed set of quantum numbers.
Answer: c

29. ml must be greater than or equal to l.
What is wrong with the following set of quantum numbers? n = 2, l = 2, ml = 0, ms = +1/2
ml must be greater than or equal to l.
l must be greater than or equal to n.
l has a maximum value of n–1.
ms must be 0 or 1.
This is an allowed set of quantum numbers.
Answer: c

30. Which orbital is described by the following set of quantum numbers
Which orbital is described by the following set of quantum numbers? n = 3 l = 1 ml = –1 1s 2s 3s 3p 3d
Answer: e

31. Which orbital is described by the following set of quantum numbers
Which orbital is described by the following set of quantum numbers? n = 3 l = 1 ml = –1 1s 2s 3s 3p 3d
Answer: e