CHEM 121 Module 7 | Foundations of General Chemistry
w/Lab Exam Q&A | Portage Learning
These are original practice questions written for study. They cover common CHEM 121
Module 7 | Quantum Theory and Atomic Structure topics: electromagnetic radiation,
Planck's equation, Bohr model, quantum numbers, orbitals, electron configuration,
periodic trends, and clinical applications.
Question 1:
Which type of electromagnetic radiation has the shortest wavelength?
A. Radio waves
B. Microwaves
C. Visible light
D. Gamma rays
Correct answer: D
Rationale: Gamma rays have the shortest wavelengths and highest energies in the
electromagnetic spectrum.
Question 2:
Which type of electromagnetic radiation has the lowest frequency?
A. Radio waves
B. Infrared
C. Ultraviolet
D. X-rays
Correct answer: A
Rationale: Radio waves have the lowest frequencies and longest wavelengths.
Question 3:
The speed of light in a vacuum is approximately:
A. 3.00 × 10⁵ m/s
B. 3.00 × 10⁸ m/s
C. 3.00 × 10¹⁰ m/s
D. 3.00 × 10¹² m/s
Correct answer: B
Rationale: The speed of light is 3.00 × 10⁸ m/s.
,Question 4:
Which equation relates the speed of light, wavelength, and frequency?
A. c = λν
B. c = λ/ν
C. c = ν/λ
D. c = λ + ν
Correct answer: A
Rationale: c = λν, where λ is wavelength and ν is frequency.
Question 5:
If wavelength increases, frequency:
A. Increases
B. Decreases
C. Stays the same
D. Becomes zero
Correct answer: B
Rationale: Wavelength and frequency are inversely proportional.
Question 6:
Which color of visible light has the longest wavelength?
A. Violet
B. Blue
C. Green
D. Red
Correct answer: D
Rationale: Red light has the longest wavelength in the visible spectrum.
Question 7:
Which color of visible light has the highest energy?
A. Red
B. Orange
C. Yellow
D. Violet
Correct answer: D
Rationale: Violet light has the shortest wavelength and highest energy.
, Question 8:
The energy of a photon is directly proportional to its:
A. Wavelength
B. Frequency
C. Speed
D. Mass
Correct answer: B
Rationale: E = hν, so energy is proportional to frequency.
Question 9:
Which equation gives the energy of a photon?
A. E = mc²
B. E = hν
C. E = λν
D. E = h/λ
Correct answer: B
Rationale: Photon energy is E = hν, where h is Planck's constant.
Question 10:
Planck's constant is approximately:
A. 6.626 × 10⁻³⁴ J·s
B. 3.00 × 10⁸ m/s
C. 1.097 × 10⁷ m⁻¹
D. 9.11 × 10⁻³¹ kg
Correct answer: A
Rationale: h = 6.626 × 10⁻³⁴ J·s.
Question 11:
The photoelectric effect provides evidence that light:
A. Is only a wave
B. Has particle properties
C. Has no energy
D. Cannot eject electrons
Correct answer: B
Rationale: The photoelectric effect shows light behaves as particles called photons.
w/Lab Exam Q&A | Portage Learning
These are original practice questions written for study. They cover common CHEM 121
Module 7 | Quantum Theory and Atomic Structure topics: electromagnetic radiation,
Planck's equation, Bohr model, quantum numbers, orbitals, electron configuration,
periodic trends, and clinical applications.
Question 1:
Which type of electromagnetic radiation has the shortest wavelength?
A. Radio waves
B. Microwaves
C. Visible light
D. Gamma rays
Correct answer: D
Rationale: Gamma rays have the shortest wavelengths and highest energies in the
electromagnetic spectrum.
Question 2:
Which type of electromagnetic radiation has the lowest frequency?
A. Radio waves
B. Infrared
C. Ultraviolet
D. X-rays
Correct answer: A
Rationale: Radio waves have the lowest frequencies and longest wavelengths.
Question 3:
The speed of light in a vacuum is approximately:
A. 3.00 × 10⁵ m/s
B. 3.00 × 10⁸ m/s
C. 3.00 × 10¹⁰ m/s
D. 3.00 × 10¹² m/s
Correct answer: B
Rationale: The speed of light is 3.00 × 10⁸ m/s.
,Question 4:
Which equation relates the speed of light, wavelength, and frequency?
A. c = λν
B. c = λ/ν
C. c = ν/λ
D. c = λ + ν
Correct answer: A
Rationale: c = λν, where λ is wavelength and ν is frequency.
Question 5:
If wavelength increases, frequency:
A. Increases
B. Decreases
C. Stays the same
D. Becomes zero
Correct answer: B
Rationale: Wavelength and frequency are inversely proportional.
Question 6:
Which color of visible light has the longest wavelength?
A. Violet
B. Blue
C. Green
D. Red
Correct answer: D
Rationale: Red light has the longest wavelength in the visible spectrum.
Question 7:
Which color of visible light has the highest energy?
A. Red
B. Orange
C. Yellow
D. Violet
Correct answer: D
Rationale: Violet light has the shortest wavelength and highest energy.
, Question 8:
The energy of a photon is directly proportional to its:
A. Wavelength
B. Frequency
C. Speed
D. Mass
Correct answer: B
Rationale: E = hν, so energy is proportional to frequency.
Question 9:
Which equation gives the energy of a photon?
A. E = mc²
B. E = hν
C. E = λν
D. E = h/λ
Correct answer: B
Rationale: Photon energy is E = hν, where h is Planck's constant.
Question 10:
Planck's constant is approximately:
A. 6.626 × 10⁻³⁴ J·s
B. 3.00 × 10⁸ m/s
C. 1.097 × 10⁷ m⁻¹
D. 9.11 × 10⁻³¹ kg
Correct answer: A
Rationale: h = 6.626 × 10⁻³⁴ J·s.
Question 11:
The photoelectric effect provides evidence that light:
A. Is only a wave
B. Has particle properties
C. Has no energy
D. Cannot eject electrons
Correct answer: B
Rationale: The photoelectric effect shows light behaves as particles called photons.
