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Atomic Physics — NEET UG Physics PYQs

198 previous year questions from Atomic Physics with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

198 questionsPhysicsSolutions on every page
1

The energy levels of certain atom are represented in the following figure. During the transition from 2E to E level, a photon of wavelength is emitted. The wavelength of photon pro

MHT CET Medical 2026 Solution View → 2

The ratio of ionization energy of a hydrogen atom in fifth excited state to second excited state is

MHT CET Medical 2026 Solution View → 3

The wavelength of radiation emitted is ' ' when an electron jumps from second to first orbit of hydrogen atom. For the electron to jump from third to first orbit of hydrogen atom,

MHT CET Medical 2026 Solution View → 4

The angular momentum of an electron in Bohr's hydrogen atom having energy -0.544 eV is (h = Planck's constant)

MHT CET Medical 2026 Solution View → 5

An electron of mass ' m_e ' and charge ' e ' revolving around the nucleus in n^ th orbit has orbital magnetic moment enh 4 m_e which is equal to Bohr Magneton, the orbit number in

MHT CET Medical 2026 Solution View → 6

The ratio of angular frequency ( ) of an electron to the total energy ( E) of an electron in the first orbit of hydrogen atom is ( h is the Plank's constant)

MHT CET Medical 2026 Solution View → 7

The ratio between the areas of Bohr's first three orbits of the hydrogen atom are

MHT CET Medical 2026 Solution View → 8

A hydrogen atom in its ground state is irradiated by light of wavelength 1026 Å . The electron gets excited to higher energy state n . Given the ground state energy is -13.6 eV and

MHT CET Medical 2026 Solution View → 9

The radius of the orbit of an electron in a hydrogen like atom is 4.5a₀ , where a₀ is the Bohr radius. Its orbital angular momentum is 3h 2 . It is given than h is Planck's constan

MHT CET Medical 2026 Solution View → 10

In the Bohr model, an electron moves in circular orbit around the proton. Considering an orbiting elecrton to be a circular current loop, the magnetic moment of the hydrogen atom,

MHT CET Medical 2026 Solution View → 11

In hydrogen spectrum the ratio of wavelengths of the last line of Lyman series and the last line of Balmer series is

MHT CET Medical 2026 Solution View → 12

In the first excited state of hydrogen atom, the energy of its electron is -3.4 eV. The radial distance of the electron from the hydrogen nucleus in this case is approximately : (T

NEET 2026 Solution View → 13

Consider that an electron is revolving in an excited state of Hydrogen atom with velocity 25.6 10^5 ms ⁻¹ . The radius of the orbit is x 10⁻⁹ m. The value of x is : [Take the mass

NEET 2026 Solution View → 14

In Geiger-Marsden experiment, the number of scattered -particles N( ) is plotted as a function of scattering angle . Which of the following options represents the correct plot ?

NEET 2026 Solution View → 15

A particle of mass m is moving around the origin with a constant force F pulling it towards the origin. If Bohr model is used to describe its motion, the radius r of the n^ th orbi

NEET 2025 Solution View → 16

De-Broglie wavelength of an electron orbiting in the n=2 state of hydrogen atom is close to (Given Bohr radius =0.052 ~nm )

NEET 2025 Solution View → 17

Given below are two statements: Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges. Statement II: Atoms of each element are s

NEET 2024 Solution View → 18

Some energy levels of a molecule are shown in the figure with their wavelengths of transitions. Then:

NEET 2024 Solution View → 19

Match List I with List II. array |l|l|l|l| & |c| array c List I (Spectral Lines of for from) array & & |c| array l List II (Wavelengths (nm)) array A. & n₂=3 to m₁=2 & I. & 410.2 B

NEET 2024 Solution View → 20

The spectral series which corresponds to the electronic transition from the levels n₂=5,6, to the level n₁=4 is

NEET 2024 Solution View → 21

The wavelength of Lyman series of hydrogen atom appears in

NEET 2023 Solution View → 22

The radius of inner most orbit of hydrogen atom is 5 . 3 × 10 - 11   m . What is the radius of third allowed orbit of hydrogen atom?

NEET 2023 Solution View → 23

In hydrogen spectrum, the shortest wavelength in the Balmer series is   λ . The shortest wavelength in the Brackett series is :

NEET 2023 Solution View → 24

The ground state energy of hydrogen atom is -13.6 eV . The energy needed to ionize hydrogen atom from its second excited state will be

NEET 2023 Solution View → 25

The angular momentum of an electron moving in an orbit of hydrogen atom is 1.5 ( h ) . The energy in the same orbit is nearly

NEET 2023 Solution View → 26

Let R₁ be the radius of the second stationary orbit and R₂ be the radius of the fourth stationary orbit of an electron in Bohr's model. The ratio R₁ R₂ is:

NEET 2022 Solution View → 27

Let T 1 and T 2 be the energy of an electron in the first and second excited states of hydrogen atom, respectively. According to the Bohr's model of an atom, the ratio T 1 : T

NEET 2022 Solution View → 28

The total energy of an electron in the n th  stationary orbit of the hydrogen atom can be obtained by

NEET 2020 Solution View → 29

For which one of the following, Bohr model is not valid?

NEET 2020 Solution View → 30

The total energy of an electron in an atom in an orbit is - 3.4   e V . Its kinetic and potential energies are, respectively,

NEET 2019 Solution View → 31

The radius of the first permitted Bohr orbit for the electron, in a hydrogen atom equals 0.51 Å and its ground state energy equals -13.6 eV . If the electron in the hydrogen atom i

NEET 2019 Solution View → 32

15 eV is given to e⁻ in 4^ th orbit, then find its final energy when it comes out of H -atom.

NEET 2019 Solution View → 33

The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is

NEET 2018 Solution View → 34

In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n-1) . If n>>1 , the frequency of radiation emitted is

NEET 2018 Solution View → 35

The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 ~nm . The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integ

NEET 2018 Solution View → 36

In hydrogen atom, electron excites from ground state to higher energy state and its orbital velocity is reduced to ( 1 3 )^ rd of its initial value. The radius of the orbit in the

NEET 2018 Solution View → 37

v₁ is the frequency of the series limit of Lyman series, v₂ is the frequency of the first line of Lyman series and v₃ is the frequency of the series limit of the Balmer series. The

NEET 2018 Solution View → 38

The potential of an atom is given by V=V₀ _e (r / r₀ ) where r₀ is a constant and r is the radius of the orbit. Assuming Bohr's model to be applicable, which variation of r_n with

JIPMER 2017 Solution View → 39

The ratio of wavelengths of the last line of the Balmer series and the last line of the Lyman series is_____.

NEET 2017 Solution View → 40

The potential of an atom is given by V=V₀ _e (r / r₀ ) where r₀ is a constant and r is the radius of the orbit. Assuming Bohr's model to be applicable, which variation of r_n with

NEET 2017 Solution View → 41

An energy of 68.0 eV is required to excite a hydrogen-like atom in its second Bohr energy level to third energy level the charge of nucleus is Ze . The wavelength of a radiation re

JIPMER 2016 Solution View → 42

If an electron in a hydrogen atom jumps from the third orbit to the second orbit, it emits a photon of wavelength λ . When it jumps from the fourth orbit to the third orbit, t

NEET 2016 Solution View → 43

Given the value of Rydberg constant is 10 7   m - 1 , the wave number of the last line of the Balmer series in hydrogen spectrum will be:

NEET 2016 Solution View → 44

Assertion: Electrons in the atom are held due to coulomb forces. Reason : The atom is stable only because the centripetal force due to Coulomb's law is balanced by the centrifugal

NEET 2016 Solution View → 45

An energy of 68.0 eV is required to excite a hydrogen-like atom in its second Bohr energy level to third energy level the charge of nucleus is Ze . The wavelength of a radiation re

NEET 2016 Solution View → 46

The electron of an H -atom is revolving around the nucleus in circular orbit having radius h^2 4 m e^2 with ( 2 e^2 h ) . The current produced due to the motion of electron is

JIPMER 2015 Solution View → 47

In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is:

NEET 2015 Solution View → 48

Consider third orbit of He + (helium), using non-relativistic approach, the speed of electron in this orbit will be given constant K =9×10 9 , Z =2 and h (Planck's Constan

NEET 2015 Solution View → 49

Total energy of an electron in hydrogen atoms above 0 eV leads to

NEET 2015 Solution View → 50

Ionisation potential of hydrogen atom is 13.6 ~V . Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV . The spectral lines emitted b

NEET 2015 Solution View → 51

The electron of an H -atom is revolving around the nucleus in circular orbit having radius h^2 4 m e^2 with ( 2 e^2 h ) . The current produced due to the motion of electron is

NEET 2015 Solution View → 52

According to Bohr's model of hydrogen atom, relation between principal quantum number n and radius of stable orbit is

JIPMER 2014 Solution View → 53

Hydrogen atom in ground state is excited by a monochromatic radiation of λ = 975   Å . Number of spectral lines in the resulting spectrum emitted will be:

NEET 2014 Solution View → 54

If the wavelength of 1^ st line of Balmer series of hydrogen is 6561 Å , the wavelength of the 2^ nd line of series will be

NEET 2014 Solution View → 55

A triply ionized beryllium ( Be ³⁺ ) has the same orbital radius as the ground state of hydrogen. Then the quantum state n of Be ³⁺ is

NEET 2014 Solution View → 56

According to Bohr's model of hydrogen atom, relation between principal quantum number n and radius of stable orbit is

NEET 2014 Solution View → 57

Ionisation potential of hydrogen atom is 13.6 eV . Hydrogen atom on the ground state rarely excited by monochromatic radiation of photon 12.1 eV . The special line emitted by a hyd

JIPMER 2013 Solution View → 58

An electron in hydrogen atom makes a transition n₁ n₂ where n₁ are principle quantum numbers of the two states. Assuming Bohr's model to be valid, the time period of the electron i

NEET 2013 Solution View → 59

Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is

NEET 2013 Solution View → 60

Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is

NEET 2013 Solution View → 61

Ionisation potential of hydrogen atom is 13.6 eV . Hydrogen atom on the ground state rarely excited by monochromatic radiation of photon 12.1 eV . The special line emitted by a hyd

NEET 2013 Solution View → 62

An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be ( m is

NEET 2012 Solution View → 63

Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths ₁: ₂ em

NEET 2012 Solution View → 64

The transition from the state n=3 to n=1 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

NEET 2012 Solution View → 65

Total energy of the electron in hydrogen atom above 0 eV leads to

NEET 2012 Solution View → 66

Assertion : Bohr's atomic model cannot be used to explain multiple electron species. Reason: It does not take inter-electronic interactions in account.

NEET 2012 Solution View → 67

Assertion: Total energy of electron in an hydrogen atom is negative. Reason : It is bounded to the nucleus.

NEET 2012 Solution View → 68

If ₁ and ₂ are the wavelengths of the first members of the Lyman and Paschen series respectively, then ₁: ₂ is

JIPMER 2011 Solution View → 69

The specific charge of a proton is 9.6 10^7 C / kg . The specific charge of an alpha particle will be

JIPMER 2011 Solution View → 70

Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model?

NEET 2011 Solution View → 71

The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen lik

NEET 2011 Solution View → 72

The series corresponding to minimum wavelength transition in H -atom

NEET 2011 Solution View → 73

The specific charge of a proton is 9.6 10^7 C / kg . The specific charge of an alpha particle will be

NEET 2011 Solution View → 74

If ₁ and ₂ are the wavelengths of the first members of the Lyman and Paschen series respectively, then ₁: ₂ is

NEET 2011 Solution View → 75

The kinetic energy of an electron, which is accelerated in the potential difference of 100 V , is

JIPMER 2010 Solution View → 76

J.J. Thomson's cathode ray tube experiment demonstrated that

JIPMER 2010 Solution View → 77

Wavelength of light emitted from second orbit to first orbit in a hydrogen atom is

JIPMER 2010 Solution View → 78

The energy of a hydrogen atom in the ground state is -13.6 eV . The energy of a He ⁺ ion in the first excited state will be

NEET 2010 Solution View → 79

The electron in the hydrogen atom jumps from excited state (n=3) to its ground state (n=1) and the photons thus emitted irradiate a photosensitive material. If the work function of

NEET 2010 Solution View → 80

What would be maximum wavelength for Brackett series of hydrogen-spectrum?

NEET 2010 Solution View → 81

What would be the radius of second orbit of He ⁺ ion?

NEET 2010 Solution View → 82

The wavelength of Lymen series for first number is

NEET 2010 Solution View → 83

The kinetic energy of an electron, which is accelerated in the potential difference of 100 V , is

NEET 2010 Solution View → 84

J.J. Thomson's cathode ray tube experiment demonstrated that

NEET 2010 Solution View → 85

Wavelength of light emitted from second orbit to first orbit in a hydrogen atom is

NEET 2010 Solution View → 86

The ionization energy of the electron in the hydrogen atom in its ground state is 13.6 eV . The atoms are excited to higher energy levels to emit radiations of 6 wavelengths. Maxim

NEET 2009 Solution View → 87

The ionization energy of the electron in the hydrogen atom in its grounds state is 13.6 eV . The atoms are excited to higher energy levels to emit radiations of 6 wavelengths. Maxi

NEET 2009 Solution View → 88

In a Rutherford scattering experiment when a projectile of charge Z₁ and mass M₁ approaches a target nucleus of charge Z₂ and mass M₂ , the distance of closest approach is r₀ . The

NEET 2009 Solution View → 89

In a Rutherford scattering experiment when a projectile of charge Z₁ and mass M₁ approaches a target nucleus of charge Z₂ and mass M ₂ , the distance of closest approach is r ₀ . T

NEET 2009 Solution View → 90

The wavelengths of K _ X -rays for lead isotopes Pb ²⁰⁸, ~Pb ²⁰⁶ and Pb ²⁰⁴ are ₁, ₂ and ₃ respectively. Then

NEET 2009 Solution View → 91

The ground state energy of hydrogen atom is -13.6 eV . When its electron is in the first excited state, its excitation energy is

NEET 2008 Solution View → 92

The ground state energy of hydrogen atom is -13.6 eV . When its electron is in the first excited state, its excitation energy is

NEET 2008 Solution View → 93

Assertion : It is essential that all the lines available in the emission spectrum will also be available in the absorption spectrum. Reason : The spectrum of hydrogen atom is only

NEET 2008 Solution View → 94

The total energy of an electron in the first excited state of hydrogen is about -3.4 eV . Its kinetic energy in this state is

JIPMER 2007 Solution View → 95

The total energy of electron in the ground state of hydrogen atom is -13.6 eV . The kinetic energy of an electron in the first excited state is:

NEET 2007 Solution View → 96

What is the energy of ( He ⁺ )electron in first orbit?

NEET 2007 Solution View → 97

The total energy of an electron in the first excited state of hydrogen is about -3.4 eV . Its kinetic energy in this state is

NEET 2007 Solution View → 98

Radius of first Bohr orbit is r . What is the radius of 2 nd Bohr orbit?

JIPMER 2006 Solution View → 99

Ionization potential of hydrogen atom is 13.6 eV . Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV . According to Bohr's theory,

NEET 2006 Solution View → 100

Radius of first Bohr orbit is r . What is the radius of 2 nd Bohr orbit?

NEET 2006 Solution View → 101

The total energy of an electron in the first excited state of hydrogen atom is about -3.4 eV . Its kinetic energy in this state is:

NEET 2005 Solution View → 102

Energy levels A , B and C of a certain action corresponding to increasing values of energy i.e. E_A < E_B < E_C . If ₁ , ₂ and ₃ are wavelength of radiations corresponding to trans

NEET 2005 Solution View → 103

The ground state energy of hydrogen atom is -13.6 eV . What is the potential energy of the electron in this state?

NEET 2005 Solution View → 104

The Bohr model of atoms:

NEET 2004 Solution View → 105

Energy E of a hydrogen atom with principal quantum number n is given by E= -13.6 n^2 eV . The energy of a photon ejected when the electron jumps for n=3 state n=2 state of hydrogen

NEET 2004 Solution View → 106

Assertion : In He-Ne laser, population inversion takes place between energy levels of neon atoms. Reason : Helium atoms have a meta-stable energy level.

NEET 2004 Solution View → 107

In which of the following systems will the radius of the first orbit (n=1) be minimum?

NEET 2003 Solution View → 108

Assertion : A tube light emits white light. Reason : Emission of light in a tube takes place at a very high temperature.

NEET 2003 Solution View → 109

Assertion : Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate. Reason : According to classical physics all moving electrons radiate.

NEET 2003 Solution View → 110

The graph which depicts the results of Rutherford gold foil experiment with α -particles is: θ : Scattering angle Y : Number of scattered α -particles detected (Plots are schematic

NEET Solution View → 111

Which of the following figure represents the variation of ln R R 0 with ln A (if R = radius of a nucleus and A = its mass number)

NEET Solution View → 112

Assertion (A) The impact parameter for -particles by 180^ is zero. Reason (R) Zero impact parameter means that the -particles tend to hit the centre of the nucleus.

NEET Solution View → 113

Given below are two statements Statement I: In hydrogen atom, the frequency of radiation emitted when an electron jumps from lower energy orbit E 1 to higher energy orbit E 2 , is

NEET Solution View → 114

The following statements are given about hydrogen atom. A. The wavelengths of the spectral lines of Lyman series are greater than the wavelength of the second spectral line of Balm

NEET Solution View → 115

Assertion : For the scattering of ( )-particles at a large angles, only the nucleus of the atom is responsible. Reason : Nucleus is very heavy in comparison to electrons.

NEET Solution View → 116

Assertion: It is essential that all the lines available in the emission spectrum will also be available in the absorption spectrum. Reason : The spectrum of hydrogen atom is only a

NEET Solution View → 117

Assertion: Hydrogen atom consists of only one electron but its emission spectrum has many lines. Reason : Only Lyman series is found in the absorption spectrum of hydrogen atom whe

NEET Solution View → 118

A proton and an electron both have energy 50 eV. Statement I : Both have different wavelengths. Statement II : Wavelength depends on energy, not on mass. In light of above statemen

NEET Solution View → 119

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In Davisson-Germer experiment wavelength associated with t

NEET Solution View → 120

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Two photons each of energy 3 (e ~V ), can't eject electron

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