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Atomic Spectra Flashcards

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1
Q

What is spectroscopy the study of (A) Heat transfer (B) Light and matter interaction (C) Particle motion (D) Atomic mass

A

A: (B) Light and matter interaction

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2
Q

Which of the following is not a type of spectrum (A) Emission (B) Absorption (C) Reflective (D) Continuous

A

A: (C) Reflective

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3
Q

Emission spectrum consists of (A) Dark lines (B) Bright lines (C) Colored bands (D) Continuous rainbow

A

A: (B) Bright lines

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4
Q

Absorption spectrum consists of (A) Bright bands (B) Black bands on colored background (C) White lines (D) Clear background

A

A: (B) Black bands on colored background

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5
Q

Which spectrum is produced by hot solid or liquid (A) Line spectrum (B) Band spectrum (C) Continuous spectrum (D) Absorption spectrum

A

A: (C) Continuous spectrum

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6
Q

Which spectrum is produced by gases under low pressure (A) Line spectrum (B) Band spectrum (C) Continuous spectrum (D) White light

A

A: (A) Line spectrum

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7
Q

Which spectrum is characteristic of molecules (A) Continuous (B) Line (C) Band (D) Absorption

A

A: (C) Band

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8
Q

Which of the following is an example of a line spectrum (A) Sunlight (B) Neon lamp (C) Incandescent bulb (D) Fluorescent tube

A

A: (B) Neon lamp

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9
Q

Which of the following produces a band spectrum (A) Hydrogen atom (B) Water vapor (C) Helium gas (D) Sodium vapor

A

A: (B) Water vapor

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10
Q

Which spectrum is produced by blackbody radiation (A) Line (B) Absorption (C) Band (D) Continuous

A

A: (D) Continuous

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11
Q

Which spectrum is observed when light from hot gas passes through a cooler gas (A) Emission (B) Continuous (C) Absorption (D) Band

A

A: (C) Absorption

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12
Q

Which region does Balmer series lie in (A) Infrared (B) Ultraviolet (C) Visible (D) X rays

A

A: (C) Visible

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13
Q

Lyman series lies in which part of EM spectrum (A) Infrared (B) Ultraviolet (C) Visible (D) Gamma rays

A

A: (B) Ultraviolet

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14
Q

Paschen series lies in which region (A) Infrared (B) Ultraviolet (C) Visible (D) Microwave

A

A: (A) Infrared

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15
Q

Series with transitions to n equals 2 in hydrogen atom is called (A) Lyman (B) Balmer (C) Paschen (D) Brackett

A

A: (B) Balmer

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16
Q

Series with transitions to n equals 1 is called (A) Balmer (B) Brackett (C) Lyman (D) Pfund

A

A: (C) Lyman

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17
Q

To get shortest wavelength in Balmer series n should be (A) 3 (B) 4 (C) infinity (D) 5

A

A: (C) infinity

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18
Q

To get longest wavelength in Balmer series n should be (A) 3 (B) 4 (C) 5 (D) 6

A

A: (A) 3

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19
Q

Series discovered by Theodore Lyman is (A) Lyman series (B) Balmer series (C) Pfund series (D) Paschen series

A

A: (A) Lyman series

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20
Q

Element discovered in the Sun before Earth using spectroscopy (A) Hydrogen (B) Oxygen (C) Helium (D) Neon

A

A: (C) Helium

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21
Q

What did Bohr model try to explain (A) Heat transfer (B) Rutherford failure (C) Blackbody radiation (D) Atomic spectrum

A

A: (D) Atomic spectrum

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22
Q

Bohr atomic model is based on (A) Classical mechanics (B) Quantum field theory (C) Semi classical theory (D) General relativity

A

A: (C) Semi classical theory

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23
Q

According to Bohr electrons move in (A) Any orbit (B) Random paths (C) Fixed orbits (D) Spiral paths

A

A: (C) Fixed orbits

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24
Q

Bohr’s first postulate talks about (A) Circular motion (B) Stationary states (C) Angular momentum (D) Quantization

A

A: (B) Stationary states

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25
Bohr second postulate relates to (A) Energy emission (B) Quantization of angular momentum (C) Energy loss (D) Emission lines
A: (B) Quantization of angular momentum
26
Expression for angular momentum in Bohr model is (A) mvr equals nh (B) mvr equals nh upon 2pi (C) mv equals nh (D) mv equals nh upon pi
A: (B) mvr equals nh upon 2pi
27
n in Bohr theory is called (A) Mass number (B) Principal quantum number (C) Electron number (D) Atomic weight
A: (B) Principal quantum number
28
Bohr model applies to (A) All atoms (B) Diatomic molecules (C) Mono electronic atoms (D) Multi electron atoms
A: (C) Mono electronic atoms
29
In Bohr’s model energy levels are (A) Continuous (B) Random (C) Quantized (D) Variable
A: (C) Quantized
30
Energy difference between levels is responsible for (A) Heat (B) Mass (C) Spectrum lines (D) Atom splitting
A: (C) Spectrum lines
31
De Broglie hypothesis suggested electrons behave as (A) Waves (B) Particles (C) Fields (D) Radiation only
A: (A) Waves
32
Expression for de Broglie wavelength is (A) λ equals h upon p (B) λ equals pv (C) λ equals mv (D) λ equals f upon p
A: (A) λ equals h upon p
33
Wave particle duality was confirmed by (A) Compton experiment (B) Rutherford scattering (C) Davisson Germer experiment (D) Oil drop experiment
A: (C) Davisson Germer experiment
34
According to de Broglie the condition for standing wave is (A) mvr equals nh (B) 2πr equals nλ (C) mv equals λh (D) E equals hf
A: (B) 2πr equals nλ
35
Bohr’s angular momentum condition is derived using (A) Spectral series (B) Wave nature (C) Absorption spectra (D) Hydrogen atom size
A: (B) Wave nature
36
Electron will remain in orbit only when (A) It is massless (B) Its wave fits perfectly (C) Energy is random (D) Nucleus is neutral
A: (B) Its wave fits perfectly
37
Waves with nodes matching nodes are called (A) Random waves (B) Standing waves (C) Traveling waves (D) Irregular waves
A: (B) Standing waves
38
First Bohr orbit radius is (A) 0.53 nm (B) 0.53 angstrom (C) 5.3 nm (D) 5.3 angstrom
A: (B) 0.53 angstrom
39
Radius of nth orbit in Bohr model is proportional to (A) n (B) n squared (C) root n (D) log n
A: (B) n squared
40
Radius of second Bohr orbit is (A) 2r1 (B) 4r1 (C) r1 (D) 3r1
A: (B) 4r1
41
Radius of third Bohr orbit is (A) 3r1 (B) 6r1 (C) 9r1 (D) r1
A: (C) 9r1
42
Spacing between Bohr orbits (A) Increases outward (B) Decreases outward (C) Remains equal (D) Is zero
A: (A) Increases outward
43
Expression for speed of electron is obtained by (A) de Broglie (B) Bohr radius (C) Angular momentum formula (D) Energy formula
A: (C) Angular momentum formula
44
Speed of electron in higher orbit (A) Increases (B) Decreases (C) Remains same (D) Doubles
A: (B) Decreases
45
Expression for energy of electron in nth orbit is (A) En equals E0 upon n (B) En equals E0 n squared (C) En equals minus E0 upon n squared (D) En equals nE0
A: (C) En equals minus E0 upon n squared
46
Energy of electron in first orbit is (A) minus 13.6 eV (B) plus 13.6 eV (C) zero (D) 6.8 eV
A: (A) minus 13.6 eV
47
Energy becomes zero when (A) Electron escapes (B) Electron is bound (C) Electron enters atom (D) Electron accelerates
A: (A) Electron escapes
48
Ground state means (A) Maximum energy (B) Infinite energy (C) Minimum energy (D) Zero mass
A: (C) Minimum energy
49
Excited state means (A) Zero energy (B) High energy (C) Nucleus break (D) Ground state
A: (B) High energy
50
Hydrogen emission is due to transition from (A) High to low orbit (B) Low to high orbit (C) Same orbit (D) Multiple nuclei
A: (A) High to low orbit
51
Formula for energy difference is (A) E equals hf (B) E equals mv squared (C) E equals En minus Ep (D) E equals mc squared
A: (C) E equals En minus Ep
52
Formula for Rydberg equation is (A) 1 upon λ equals RH(1 upon n1 squared minus 1 upon n2 squared) (B) E equals hf (C) p equals mv (D) λ equals h upon mv
A: (A) 1 upon λ equals RH(1 upon n1 squared minus 1 upon n2 squared)
53
How many spectral series are there in hydrogen atom (A) Three (B) Four (C) Five (D) Six
A: (C) Five
54
Who discovered Balmer series (A) Rydberg (B) Lyman (C) Paschen (D) Balmer
A: (D) Balmer
55
Pfund series belongs to which region (A) Infrared (B) Ultraviolet (C) Visible (D) Microwave
A: (A) Infrared
56
What is the principal quantum number for Paschen series lower level (A) 1 (B) 2 (C) 3 (D) 4
A: (C) 3
57
Shortest wavelength in any series is obtained when final level is (A) 1 (B) 2 (C) 3 (D) Infinity
A: (A) 1
58
What is the value of Rydberg constant in meter inverse (A) 1.097 x 10^7 (B) 6.63 x 10^-34 (C) 3 x 10^8 (D) 1.6 x 10^-19
A: (A) 1.097 x 10^7
59
The formula for Rydberg constant depends on (A) Speed of light and Planck constant (B) Planck constant and charge (C) Electron charge and mass (D) Electron mass and speed of light
A: (A) Speed of light and Planck constant
60
Which model explains spectral lines of hydrogen (A) Rutherford model (B) Bohr model (C) Thomson model (D) Quantum field model
A: (B) Bohr model
61
In which orbit is the electron most tightly bound (A) Third (B) Infinite (C) First (D) Second
A: (C) First
62
Energy of electron in nth orbit is inversely proportional to (A) n (B) n squared (C) square root n (D) cube root n
A: (B) n squared
63
Electron in infinite orbit has energy (A) Zero (B) Minimum (C) Maximum (D) Negative infinite
A: (A) Zero
64
Ionization potential corresponds to energy required to remove electron from (A) Excited state (B) Ground state (C) Any orbit (D) Infinite orbit
A: (B) Ground state
65
What is the excitation potential from n equals 1 to n equals 2 in hydrogen atom (A) 10.2 eV (B) 13.6 eV (C) 3.4 eV (D) 6.8 eV
A: (A) 10.2 eV
66
De Broglie wavelength is inversely proportional to (A) Energy (B) Mass (C) Momentum (D) Velocity squared
A: (C) Momentum
67
De Broglie wave nature is evident in (A) Stationary electron (B) High energy photons (C) Electron diffraction (D) Blackbody radiation
A: (C) Electron diffraction
68
De Broglie interpretation of Bohr orbit relates to (A) Newton laws (B) Angular momentum (C) Wave fitting in orbit (D) Coulomb force
A: (C) Wave fitting in orbit
69
Bohr second postulate is justified using (A) Energy levels (B) de Broglie waves (C) Momentum conservation (D) Nuclear radius
A: (B) de Broglie waves
70
According to de Broglie only those orbits are allowed where (A) Speed is constant (B) Wave fits completely (C) Energy is zero (D) Radius is large
A: (B) Wave fits completely
71
In which case will nodes and antinodes not cancel out (A) Integral wavelengths fit (B) Wave is irregular (C) Orbit is random (D) Circular motion fails
A: (A) Integral wavelengths fit
72
Speed of electron in hydrogen atom first orbit is about (A) 2.2 x 10^6 m/s (B) 3 x 10^8 m/s (C) 1 x 10^5 m/s (D) 1.6 x 10^-19 m/s
A: (A) 2.2 x 10^6 m/s
73
Which term describes lowest energy configuration (A) Excited state (B) Metastable state (C) Ground state (D) Ionized state
A: (C) Ground state
74
Metastable state refers to (A) Ground energy level (B) Stable long lived excited state (C) Vacuum state (D) Zero potential
A: (B) Stable long lived excited state
75
In hydrogen atom the total energy of electron is (A) Positive (B) Negative (C) Zero (D) Infinite
A: (B) Negative
76
Which emission is used in laser generation (A) Stimulated emission (B) Spontaneous emission (C) Blackbody emission (D) Absorption
A: (A) Stimulated emission
77
What condition is needed for laser action (A) Normal population (B) Population inversion (C) No photons (D) Emission blockage
A: (B) Population inversion
78
Who proposed the stimulated emission theory (A) Einstein (B) Bohr (C) Heisenberg (D) Planck
A: (A) Einstein
79
What is full form of LASER (A) Light Amplification by Stimulated Emission of Radiation (B) Light Analysis System Emission Radiation (C) Low Amplified Surface Emission Ray (D) Light Array Stimulated Energy Radiation
A: (A) Light Amplification by Stimulated Emission of Radiation
80
Helium neon laser uses ratio of helium to neon as (A) 10 to 1 (B) 1 to 10 (C) 2 to 1 (D) 5 to 1
A: (C) 5 to 1
81
What is active medium in helium neon laser (A) Helium only (B) Neon only (C) Helium and neon (D) Argon
A: (C) Helium and neon
82
Which of the following is not a laser use (A) Barcode reading (B) Fusion reaction (C) X-ray detection (D) Telecommunication
A: (C) X-ray detection
83
Which process increases energy of electrons in atoms (A) Absorption (B) Emission (C) Reflection (D) Refraction
A: (A) Absorption
84
Which process releases photon after decay (A) Stimulated emission (B) Induced absorption (C) Reflection (D) Refraction
A: (A) Stimulated emission
85
X-rays are waves of what range (A) 400 to 700 nm (B) 10^-10 to 10^-12 m (C) 10^-6 to 10^-8 m (D) 10 to 100 m
A: (B) 10^-10 to 10^-12 m
86
X-rays were discovered by (A) Roentgen (B) Rutherford (C) Planck (D) Hertz
A: (A) Roentgen
87
X-rays are used in (A) Electric circuits (B) Welding (C) Medical imaging (D) Solar panels
A: (C) Medical imaging
88
Which X-rays are sharp and element specific (A) Continuous (B) Band (C) Characteristic (D) Diffuse
A: (C) Characteristic
89
What is cause of continuous X-rays (A) Specific shell transitions (B) Braking radiation (C) Beta decay (D) UV transition
A: (B) Braking radiation
90
Which effect explains continuous X-rays (A) Compton effect (B) Photoelectric effect (C) Bremsstrahlung effect (D) Blackbody radiation
A: (C) Bremsstrahlung effect
91
K alpha lines arise from transition to (A) L shell (B) K shell (C) M shell (D) N shell
A: (B) K shell
92
X-rays are visualized on (A) Digital screen (B) Fluorescent screen (C) Oscilloscope (D) Radiometer
A: (B) Fluorescent screen
93
Electron microscope works on principle of (A) Particle theory (B) Refraction (C) Electron diffraction (D) Polarization
A: (C) Electron diffraction
94
Which type of microscope gives 3D image (A) Optical (B) Compound (C) Scanning electron microscope (D) Transmission microscope
A: (C) Scanning electron microscope
95
In SEM the image is formed by (A) Transmitted electrons (B) Reflected light (C) Scattered electrons (D) Magnetic field
A: (C) Scattered electrons
96
Which microscope has better resolution (A) Optical (B) Transmission electron (C) Light (D) Dissecting
A: (B) Transmission electron
97
Why can’t optical microscope resolve atoms (A) Low brightness (B) Long wavelength of light (C) High resolution (D) Weak lenses
A: (B) Long wavelength of light
98
Hydrogen atom makes a transition from level 4 to level 2. What is the wavelength of emitted photon? (A) 410 nm (B) 434 nm (C) 486 nm (D) 656 nm
A: (C) 486 nm
99
The ratio of minimum to maximum wavelength in the Balmer series is? (A) 4:5 (B) 5:4 (C) 9:5 (D) 5:9
A: (C) 9:5
100
The ground state energy of He⁺ ion is how many times that of hydrogen atom? (A) 4 (B) 2 (C) 1/2 (D) 1/4
A: (A) 4
101
The lifetime of an electron in a metastable state is of the order of? (A) 10⁸ s (B) 10³ s (C) 10⁻⁸ s (D) 10⁻³ s
A: (D) 10⁻³ s
102
Two electrons revolve in orbits of radius r and 9r respectively. What is the ratio of their frequencies? (A) 1:8 (B) 8:1 (C) 1:27 (D) 27:1
A: (D) 27:1
103
In which of the following systems is the wavelength of the n = ∞ to n = 1 transition minimum? (A) Hydrogen (B) Deuterium (C) He⁺ (D) Li²⁺
A: (D) Li²⁺
104
A hydrogen atom moving at 4000 m/s absorbs a photon and stops. What is the wavelength of the photon? (A) 1000 Å (B) 2000 Å (C) 3000 Å (D) 4000 Å
A: (A) 1000 Å
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