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 12 of 18
- A. Lyman series
- B. Balmer series
- C. Bracket series
- D. Paschen series
Explanation: E(Layman)>E(Balmer)>E(paschen)> E(bracket)>E(p-fund). The reverse order is for wavelengths.1/λ=Rh(1/p2-1/n2) Where Rh is Rydberg constant…
Correct answer: Lyman series- A. 36R/5
- B. 36R/7
- C. 36R/11
- D. 36R/13
Explanation: For longest wavelength, λ(longest)=(p×n) 2/(p+n)RHlongest wavelength is observed in balmer series if the transition takes place from n=2…
Correct answer: 36R/5- A. RH
- B. 1/RH
- C. 3RH
- D. 5/RH
Explanation: For shortest wavelength , λ( shortest)= P2/RHFor the Lyman series, n=1.For the shortest wavelength in the Lyman series (i.e., series…
Correct answer: 1/RH- A. Balmer
- B. Paschan
- C. Lyman
- D. Bracket
Explanation: Provided the figure 19.2 in pg#344 in FTB, Lyman series are the only series that lies in the Ultraviolet region of the line spectrum.
Correct answer: Lyman- A. Brackett series
- B. Paschen series
- C. Lyman series
- D. Balmer series
- E. Pfund series
Explanation: The Balmer series is a set of spectral lines in the hydrogen emission spectrum corresponding to electron transitions from higher energy…
Correct answer: Balmer series- A. Ionization potential
- B. Excitation potential
- C. String potential
- D. Acceleration potential
Explanation: Excitation potential refers to the minimum energy required to excite an atom or molecule from its ground state to a higher energy state…
Correct answer: Excitation potential- A. Have higher wavelength than visible light
- B. They are part of electromagnetic spectrum
- C. They are highly penetrating in soft body tissues
- D. They are high energy photons
Explanation: This statement is incorrect. X-rays have a shorter wavelength than visible light, typically in the range of 0.01 to 10 nanometers, while…
Correct answer: Have higher wavelength than visible light- A. balmer
- B. Bracket
- C. Lyman
- D. Paschen
Explanation: Balmer series lies in the visible region.
Correct answer: balmer- A. far-infrared region
- B. infrared region
- C. ultraviolet region
- D. visible region
Explanation: The Lyman series lies in the ultraviolet region of the hydrogen spectrum.
Correct answer: ultraviolet region- A. 4/3RH
- B. 3/4RH
- C. RH
- D. 4RH
Explanation: 1/λ =RH (1/n12-1/n22)= RH (1/12-1/22)λ =4/3RH
Correct answer: 4/3RH- A. Line spectra
- B. Solar spectra
- C. Continuous spectra
- D. Band spectra
Explanation: Band spectra - Correct: Molecular spectra appear as bands due to rotational and vibrational energy transitions in molecules
Correct answer: Band spectra- A. Is the only one for which the quantum theory be used
- B. Is the only series that occurs for hydrogen
- C. Is in the visible region
- D. Involves the lowest possible quantum number "n"
Explanation: Balmar series is the only series that lies in visible region.
Correct answer: Is in the visible region- A. Conduction
- B. Convection
- C. Thermionic emission
- D. None of these
Explanation: Electrons are emitted in the production of X rays by heating filament and this process is called thermionic emission and electrons are…
Correct answer: Thermionic emission- A. Zero potential
- B. High negative potential
- C. Low negative potential
- D. Positive potential
Explanation: Option A: The target would not be given a zero potential, because there would be no potential difference between the filament and the…
Correct answer: Zero potential- A. 13.6 V
- B. 136.0 V
- C. 3.4 V
- D. None of these options are correct
Explanation: Ionization energy is also called ionization potential. Therefore, ionization energy will be equal to ionization potential.
Correct answer: 13.6 V- A. Balmer
- B. Pfund
- C. Paschen
- D. None of these options is correct
Explanation: Bracket series is obtained when all transition of electron terminates on 4th orbit.Option A; balmer series is obtained when all transition…
Correct answer: None of these options is correct- A. Band spectra
- B. Line spectra
- C. Emission spectra
- D. Absorption spectra
Explanation: Option A : Spectra corresponding to sodium vapour lamp is not band spectra.Option B : Spectra corresponding to sodium vapour lamp is not…
Correct answer: Emission spectra- A. He+
- B. Li++
- C. Ne+9
- D. Na10+
Explanation: Expalnation will be adoption: A An ionic atom is equivOption: A ydrogen atom has wavelength equal to ¼ of the wavelengths of hydrogen…
Correct answer: He+- A. Characteristic X-Rays
- B. Continuous X-Rays
- C. Characteristic & Continuous X-Rays
- D. None of the options given
Explanation: Characteristic X-rays are a unique property of individual elements.A high-energy electron knocks out an already existing electron in one…
Correct answer: Characteristic X-Rays- A. Lyman
- B. Paschen
- C. Balmer
- D. Pfund
Explanation: •Balmer lies in a visible region. •Lyman lies in the ultraviolet region. •Paschen, pfund series are found in the infrared region.
Correct answer: Balmer