Free Atomic Spectra MCQs with Answers
356 Atomic Spectra MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Atoms emit or absorb light at specific wavelengths because electrons occupy quantized energy levels and change levels by absorbing or releasing photons. The topic covers emission and absorption spectra, spectral series, hydrogen’s line spectrum, energy-level transitions, and the relation between wavelength, frequency and photon energy.
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Read the Atomic Spectra notesFree MDCAT chapter notes with key terms356 questions · page 11 of 18
- A. Lyman
- B. Balmer
- C. Bracket
- D. Paschen
Explanation: In atomic physics, the Lyman, Balmer, Brackett, and Paschen series are spectral series that describe the emission or absorption of photons…
Correct answer: Paschen- A. Rutherford's model
- B. Maxwell's model
- C. Dalton's mode
- D. Bohr's model
Explanation: Bohr's model of the hydrogen atom, proposed by Niels Bohr in 1913, successfully explained the observed spectral lines in the hydrogen…
Correct answer: Bohr's model- A. Ionization energy
- B. Excitation energy
- C. Excitation potential
- D. Ionization potential
Explanation: When an electron is emitted from an atom or a molecule, the energy required to remove the electron completely from its bound state is…
Correct answer: Ionization energy- A. 1.093 10-6 m
- B. 2.524 x 10^-6 m
- C. 3.645 x 10^-7 m
- D. 4.140 x 10^-7 m
Explanation: To calculate the wavelength of a spectral line resulting from a transition in a hydrogen atom, we can use the Rydberg formula:1/λ = R_H *…
Correct answer: 1.093 10-6 m- A. Lymen series
- B. Balmer Series
- C. Paschen series
- D. Bracket series
- E. Pfund series
Explanation: Lyman series of hydrogen atom lies in ultraviolet region, Balmer series lies in visible region while Pfund and Paschen series lie in…
Correct answer: Balmer Series- A. K alpha
- B. K beta
- C. K gamma
- D. M series
Explanation: M X-ray photons will have the longest wavelength because they correspond to transitions involving lower energy differences compared to Kα…
Correct answer: M series- A. Lyman and Balmer
- B. Balmer and Paschen
- C. Paschen and Brakett
- D. Lyman and Pfund
Explanation: Lyman(ultraviolet)Balmer(visible)Paschen(infrared)Bracket(infrared)Pfund(infrared)
Correct answer: Paschen and Brakett- A. 187000000 m
- B. 187000000/ m
- C. 0.00000187 m
- D. 0.00000187 / m
Explanation: Given the options provided, 0.00000187 m (which is 1.87 µm) represents the longest wavelength of radiation in the Paschen series.
Correct answer: 0.00000187 m- A. 𝜆=8/RH
- B. 𝜆=9/RH
- C. 𝜆=19/RH
- D. 𝜆=4/RH
Explanation: The Paschen series corresponds to electron transitions from higher energy levels down to the n=3 level.
Correct answer: 𝜆=9/RH- A. R
- B. 4/3
- C. 3/4
- D. 4
Explanation: The explanation of this question is given below;Maximum wavelength/Minimum wavelength = 121.6 nm/91.2 nm = 1.333...
Correct answer: 4/3- A. 21.7 x 10^-19 J
- B. 13.6 x 10^-19 J
- C. 3.4 x 10^-19 J
- D. 8.2 x 10^-19 J
Explanation: This is the correct answer. The series limit for the Balmer series corresponds to the transition of an electron from n = ∞ (infinity) to n…
Correct answer: 21.7 x 10^-19 J- A. 0.529 * 3^2 Å
- B. 0.529 * 2^2 Å
- C. 0.529 * 4^2 Å
- D. 0.529 Å
Explanation: This is the correct answer. According to Bohr's model, the radius of an electron's orbit in a hydrogen atom is given by:rn = n^2 *…
Correct answer: 0.529 * 3^2 Å- A. High-energy electromagnetic radiations
- B. Electrons
- C. Protons
- D. Neutrons
Explanation: This is the correct answer. Gamma rays are a type of electromagnetic radiation, similar to visible light, X-rays, and radio waves.
Correct answer: High-energy electromagnetic radiations- A. K to M shell
- B. N to K shell
- C. L to K shell
- D. M to L shell
Explanation: K-alpha (Kα) rays are a type of X-ray that is emitted when an electron transitions from a higher energy level to a lower energy level…
Correct answer: L to K shell- A. Quanta
- B. Shell
- C. Clouds
- D. Wavelengths
Explanation: According to Bohr's model of the hydrogen atom (1913), electrons occupy specific energy levels or shells around the nucleus.
Correct answer: Shell- A. 1/RH
- B. 9/RH
- C. 4/3 RH
- D. 4/2RH
Explanation: Explanation:The Lyman series corresponds to transitions to the n = 1 energy level in the hydrogen atom.The longest wavelength corresponds…
Correct answer: 4/3 RH- A. 4RH/3
- B. RH/4
- C. 4/RH
- D. 4/3RH
- E. 3R/4
Explanation: If ′R ′ is the Rydberg constant for hydrogen, then the wave number of the first line in the Lyman series is: 3R/4.
Correct answer: 3R/4- A. 13.6J
- B. 13.6eV
- C. -13.6eV
- D. 13.6keV
- E. 13.6kJ
Explanation: The kinetic energy of an electron in the first Bohr radius of a hydrogen atom is 13.6 eV.
Correct answer: 13.6eV- A. ultraviolet
- B. infrared
- C. visible
- D. all of these
Explanation: The line spectrum of a hydrogen atom contains spectral lines in the regions of ultraviolet, infrared, and visible light.
Correct answer: all of these- A. 2.19 x 10^6 ms-1
- B. 2.19x 10- 6 ms- 1
- C. 2.19 x 10^4 ms-1
- D. 2.19 x 10^-4 ms-1
Explanation: According to Bohr's model of the hydrogen atom, the speed of an electron in the first Bohr orbit can be calculated using the formula: v =…
Correct answer: 2.19 x 10^6 ms-1