Free Atomic Spectra MCQs with Answers

• A. A
• B. B
• C. C
• D. D

Explanation: The graph, shown in option A, comprises of two types of X-rays, labeled in the graph presented below;1.

• A. hfKα = EL - EK
• B. hc = EL - EK
• C. h/λKα = EL - EK
• D. hfKα = EK - EL

Explanation: When an electron is removed from the K-shell, leaving a hole, an electron from a higher energy level (L-shell in this case) can jump down…

• A. It must have low melting point
• B. It must have low atomic number
• C. It must have high reflecting ability
• D. It must have high atomic number

Explanation: An X-ray tube is a device that produces X-rays by accelerating electrons and directing them towards a target material.

• A. Optical pumping
• B. Optical fibre
• C. Optical instrument
• D. Optical polarization

Explanation: Optical pumping is the process of photon emission at an element, since amplification of photons is needed to produce a laser, photon…

• A. Neon
• B. Helium
• C. Helium and Neon
• D. Chromium

Explanation: In a Helium-Neon laser, population inversion of C. Helium and Neon atoms is achieved which emit radiations, when they are stimulated to…

• A. 10-6 m
• B. 10-10 m
• C. 10-13 m
• D. 100 m

Explanation: X-ray wavelength is in range of 10−11 m to 10−8 m.

• A. Computed technology
• B. Computed tomography
• C. Holography
• D. Computerized axial tomography

Explanation: Holography is a technique based on wave interference to record and form three-dimensional images.

• A. Electrons are emitted
• B. Stimulated emission of electrons is needed
• C. Coherent monochromatic light is emitted
• D. There is a population inversion of photons

Explanation: A and B are incorrect because photons are emitted. D is incorrect because population inversion of atoms is achieved.

• A. The absorption of neutrons by target material
• B. The bombardment of target material by protons
• C. The bombardment of target material by electrons
• D. The bombardment of target material by alpha particles

Explanation: The characteristic x-rays are obtained due to the transition of electron from inner orbits of the atoms, so the target is bombarded by…

• A. λA = λB
• B. λA > λB
• C. λA < λB
• D. λA = 2λB

Explanation: Wavelengths of photons in a laser action are all the same hence the wavelength of A is equal to the wavelength of B.

• A. Bones lie between the flesh
• B. Bones are light in color
• C. Bones contain material of low densities
• D. Bones contain material of high densities

Explanation: Bones absorb more amounts of incident X-rays than flesh because bones contain a very large amount of calcium which makes it highly…

• A. Cooling the target
• B. Reducing the temperature of the filament
• C. Increasing the potential difference between the cathode and the target
• D. Reducing the pressure in the tube

Explanation: Increasing the potential difference between the cathode and the target can accelerate the electrons, resulting in higher energies when…

• A. Precise measurement of range finding
• B. Optical fiber communication systems
• C. Surveying for construction of tunnels
• D. Welding detached bone of body

Explanation: Helium-neon lasers serve in industrial alignment to determine straight lines with the laser beam in the construction of buildings…

• A. K - alpha
• B. M - alpha
• C. K - beta
• D. M - beta

Explanation: When electrons from the M shell jump to occupy the hole in the K shell, the photons emitted are K-beta, and the energy emitted is hf = EM…

• A. 3:2
• B. 4:9
• C. 9:4
• D. 2:3

Explanation: Emax(KE) = hfmax = eV, V and KE are in direct relation so V:V and KE:KE ratios would be the same.

• A. Capacitor Amplifier Transistor
• B. Computerized Axial Tomography
• C. Cathode Anode Technique
• D. Current Amplification Technology

Explanation: CAT stands for "Computerized Axial Tomography." It is commonly known as CT scan (Computerized Tomography scan).

• A. Population inversion
• B. Ground State
• C. Excited state
• D. Metastable state

Explanation: Population inversion refers to a condition in which the number of atoms or molecules in an excited state (such as E2) is greater than the…

• A. Kα X-Ray
• B. Kß X-Ray
• C. Kγ X-Ray
• D. All of these options have the same intensity

Explanation: Kα X-rays exhibit the largest intensity due to the considerable energy released when an electron transitions from the n=2 to n=1 energy…

• A. Lyman
• B. Paschen
• C. Balmer
• D. Pfund

Explanation: Four of the Balmer lines are in the technically visible part of the spectrum, with wavelengths between 400nm−700nm.The Lyman, Balmer…

• A. low ... high
• B. high ... low
• C. low ... low
• D. high ... high

Explanation: In fluorescence, a photon is absorbed which takes an atom or molecule to a higher energy level.