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NEET Dual Nature of Matter PYQs with Solutions

377 previous year questions from Dual Nature of Matter (NEET UG Physics) with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

377 questionsPhysics2002–2026Answers + solutions

About Dual Nature of Matter PYQs

Dual Nature of Matter has 377 previous year questions in the Quantrex Academy NEET UG Physics bank. The 220 questions in this list come from NEET (176), MHT CET Medical (22) and JIPMER (22), spanning 2002 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

Questions by year (this list)

  • 2026: 27
  • 2025: 2
  • 2024: 4
  • 2023: 4
  • 2022: 4
  • 2021: 2
  • 2020: 3
  • 2019: 5
  • 2018: 2
  • 2017: 4
  • 2016: 6
  • 2015: 5

Dual Nature of Matter questions with solutions

1

An electron and positron are accelerated from rest to the same kinetic energy. The ratio of their de Broglie wavelengths is

MHT CET Medical 2026 Solution View → 2

An electron of mass m and charge e initially at rest gets accelerated by a constant electric field E. The de-Broglie wavelength of the electron at time t is (h = Planck's constant)

MHT CET Medical 2026 Solution View → 3

The wavelength λ_e of an electron and λ_P of a photon of same energy E are related as

MHT CET Medical 2026 Solution View → 4

A light of wavelength λ(λ < λ_0) falls on a metal surface. The momentum of the fastest moving electron is p . In order to have the momentum of an electron equal to 2p , the

MHT CET Medical 2026 Solution View → 5

The de Broglie wavelength of an electron with kinetic energy K_1 is λ_1 . If the kinetic energy increases to 5K_1 , the new wavelength is λ_2 = xλ_1 . The value of x is

MHT CET Medical 2026 Solution View → 6

A student plots two different graphs using the same photoelectric experiment data. 1. Maximum kinetic energy (K_ ) against frequency (ν ) 2. Stopping potential (V_o ) against

MHT CET Medical 2026 Solution View → 7

In a photoelectric cell, for the incident radiation of wavelength λ , the fastest electron has speed 'v'. If the wavelength of incident radiation is changed to (λ)/(3) , the speed

MHT CET Medical 2026 Solution View → 8

A particle is dropped from a height ' y '. The de-Broglie wavelength of the particle as a function of height is

MHT CET Medical 2026 Solution View → 9

Light of frequency 4ν_0 is incident on the metal of threshold frequency ν_0 . The maximum kinetic energy of the emitted photoelectron is ( h = Planck's constant)

MHT CET Medical 2026 Solution View → 10

In an interference experiment, interference was observed using waves associated with electrons having de-Broglie wavelength λ . The electrons are produced by using an electron-gun

MHT CET Medical 2026 Solution View → 11

In the case of the photo-electric effect, which of the following sentences is NOT TRUE? a. The photo-electrons are emitted only when the frequency of incident radiation is greater

MHT CET Medical 2026 Solution View → 12

If the photoelectric work function of a metal is ' φ ' and the frequency of incident light is ' ν ', there is no emission of photoelectrons if

MHT CET Medical 2026 Solution View → 13

The de-Broglie wavelength of the free electron is ' λ ' and has a kinetic energy E_k . If the kinetic energy of the free electron is made double, the new de-Broglie wavelength is

MHT CET Medical 2026 Solution View → 14

Let E_e and E_p represent kinetic energy of electron and photon respectively. If de-Broglie wavelength λ_p of a photon is four times the de-Broglie wavelenght λ_e of an electron

MHT CET Medical 2026 Solution View → 15

A photon of energy 8 eV is incident on a metal surface of work function 3.75 eV. The stopping potential of the metal is

MHT CET Medical 2026 Solution View → 16

An electron of mass ' m ' accelerated through a potential difference ' V ' has the de Broglie wavelength associated with it as ' λ '. If a proton of a mass ' M ' is accelerated

MHT CET Medical 2026 Solution View → 17

An electron of mass m and a photon have the same energy E. The ratio of de-Broglie wavelengths associated with them ( (λ_e)/(λ_p) ) is c = velocity of light

MHT CET Medical 2026 Solution View → 18

When light of wavelength ' λ ' is incident on a photosensitive surface, the stopping potential is ' V '. When light of wavelength ' 2λ ' is incident on the same surface, the

MHT CET Medical 2026 Solution View → 19

At the stopping potential, the photoelectrons have

MHT CET Medical 2026 Solution View → 20

When a light beam of frequency υ is incident on a metal surface, photoelectrons are emitted. If these electrons describe a circle of radius r in a magnetic field of strength B

MHT CET Medical 2026 Solution View → 21

Statement I - When the wavelength of incident radiation in a photoelectric experiment is decreased, then the stopping potential will decrease. Statement II - In photoelectric

MHT CET Medical 2026 Solution View → 22

The additional energy that should be given to an electron to reduce its de-Broglie wavelength from 1 nm to 0.5 nm is x times the initial kinetic energy. The value of x is

MHT CET Medical 2026 Solution View → 23

Match List I with List II : List I List II A. E = hν I. de Broglie wavelength B. Diffraction and Interference II. Particle nature of light C. λ = h/p III. Wave nature of light D.

NEET 2026 Solution View → 24

A beam of light falls on a metal surface such that photo-electrons are generated. If power of the light source starts to decrease linearly with time t , then variation of the

NEET 2026 Solution View → 25

A photon and an electron, each of 20 eV energy, move in free space. The ratio of linear momentum of electron p_e to that of photon p_ Ph , p_e p_ Ph is : (Take speed of light

NEET 2026 Solution View → 26

For a metal of work function 6.6 eV, which of the following wavelengths of incident radiation does not give rise to the photoelectric effect ? (Take Planck's constant as 6.6 × 10^

NEET 2026 Solution View → 27

A ray of light with wavelength λ is incident on three different photo-electric cells namely 1, 2 and 3. The threshold wavelength of these photo-electric cells are λ_1 , λ_2 , and

NEET 2026 Solution View → 28

A photon and an electron (mass m ) have the same energy E . The ratio ( λ_ photon / λ_ electron ) of their de Broglie wavelengths is: (c is the speed of light)

NEET 2025 Solution View → 29

Which of the following options represent the variation of photoelectric current with property of light shown on the x -axis?

NEET 2025 Solution View → 30

If c is the velocity of light in free space, the correct statements about photon among the following are: A. The energy of a photon is E=h v . B. The velocity of a photon is c .

NEET 2024 Solution View → 31

If φ is the work function of photosensitive material in eV and light of wavelength of numerical value λ=(h c)/(e) metre, is incident on it with energy above its threshold value at

NEET 2024 Solution View → 32

An electron and an alpha particle are accelerated by the same potential difference. Let λ_ ε and λ_a denote the de-Broglie wavelengths of the electron and the alpha particle

NEET 2024 Solution View → 33

The graph which shows the variation of ((1)/(λ^2)) and its kinetic energy, E is (where λ is de Broglie wavelength of a free particle):

NEET 2024 Solution View → 34

The maximum kinetic energy of the emitted photoelectrons in photoelectric effects is independent of:

NEET 2023 Solution View → 35

The de Broglie wavelength associated with an electron, accelerated by a potential difference of 81 ~V is given by:

NEET 2023 Solution View → 36

The work functions of Caesium ( Cs ) , Potassium ( K ) and Sodium ( Na ) 2 . 14eV, 2 . 30eVand2 . 75eV are respectively. If incident electromagnetic radiation has an incident

NEET 2023 Solution View → 37

The minimum wavelength of X -rays produced by an electron accelerated through a potential difference of V volts is proportional to:

NEET 2023 Solution View → 38

The light rays having photons of energy 4.2 eV are falling on a metal surface having a work function of 2.2 eV . The stopping potential of the surface is:

NEET 2022 Solution View → 39

The threshold frequency of a photoelectric metal is v_0 . If light of frequency 4 v_0 is incident on this metal, then the maximum kinetic energy of emitted electrons will be:

NEET 2022 Solution View → 40

The graph which shows the variation of the de Broglie wavelength (λ) of a particle and its associated momentum (p) is :

NEET 2022 Solution View → 41

When two monochromatic lights of frequency, ν and (ν)/(2) are incident on a photoelectric metal, their stopping potential becomes V _ S 2 and V _ s respectively. The threshold

NEET 2022 Solution View → 42

An electromagnetic wave of wavelength λ is incident on a photosensitive surface of negligible work function. If m mass is of photoelectron emitted from the surface has de-Broglie

NEET 2021 Solution View → 43

The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600nm , when it delivers the power of 3 . 3 × 10 ^ - 3 W will be : (h = 6

NEET 2021 Solution View → 44

The de-Broglie wavelength of an electron moving with kinetic energy of 144eV is nearly

NEET 2020 Solution View → 45

An electron is accelerated from rest through a potential difference of V volt. If the de Broglie wavelength of the electron is 1.227 × 10 ^ – 2 nm , the potential difference is:

NEET 2020 Solution View → 46

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is

NEET 2020 Solution View → 47

If frequency of a photon is 6 × 10^ 14 ~Hz , then find its wavelength. [Take, speed of light, c=3 × 10^8 ~m / s ]

JIPMER 2019 Solution View → 48

An LED is constructed from a p-n junction diode using GaAsP. The energy gap is 1.9 eV . The wavelength of the light emitted will be equal to

NEET 2019 Solution View → 49

The work function of a photosensitive material is 4.0 eV . This longest wavelength of light that can cause photon emission from the substance is (approximately)

NEET 2019 Solution View → 50

A proton and an α -particle are accelerated from rest to the same energy. The de-Broglie wavelengths λ_p and λ_α are in the ratio

NEET 2019 Solution View → 51

An electron is accelerated through a potential difference of 10,000V . Its de Broglie wavelength is (nearly): ( m _ e = 9 × 1 0 ^ - 31 kg)

NEET 2019 Solution View → 52

An electron of mass m with an initial velocity → V = V _ 0 ^ i ( V _ 0 > 0 ) enters in an electric field → E = -E _ 0 ^ i ( E _ 0 > 0 and is a constant ) at t = 0 . If λ _ 0 is

NEET 2018 Solution View → 53

When the light of frequency 2 ν _ 0 (where ν _ 0 is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is v _ 1 . When the frequency of

NEET 2018 Solution View → 54

A photo cell is illuminated by a small bright source placed 1m away. When the same source of light is placed 2 m away, the electrons emitted by photo cathode

JIPMER 2017 Solution View → 55

The wavelength λ of a photon and the de-Broglie wavelength of an electron have the same value. Find the ratio of energy of photon to the kinetic energy of electron in terms of

JIPMER 2017 Solution View → 56

The photoelectric threshold wavelength of silver is 3250 × 10 ^ – 10 m . The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 × 10 ^

NEET 2017 Solution View → 57

The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (Kelvin) and mass m is:

NEET 2017 Solution View → 58

The graph (1)/(λ) and stopping potential (V) of three metals having work function φ_1, φ_2 and φ_3 in an experiment of photoelectric effect is plotted as shown in the figure.

JIPMER 2016 Solution View → 59

An isotropic point source emits light with wavelength 500 nm . The radiation power of the source is P=10 ~W . Find the number of photons passing through unit area per second at a

JIPMER 2016 Solution View → 60

Electrons of mass, m with de-Broglie wavelength, λ fall on the target in an X-ray tube. The cutoff wavelength, ( λ _ 0 ) of the emitted X-ray is

NEET 2016 Solution View → 61

Photons with energy of 5eV are incident on a cathode, C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on

NEET 2016 Solution View → 62

An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is: ( c being velocity of light)

NEET 2016 Solution View → 63

When a metallic surface is illuminated with radiation of wavelength λ , the stopping potential is V . If the same surface is illuminated with radiation of wavelength 2λ , the

NEET 2016 Solution View → 64

In photoelectric effect, the number of photo-electrons emitted is proportional to

JIPMER 2015 Solution View → 65

A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and (λ)/(2) . If the maximum kinetic energy of the emitted photoelectrons in the second

NEET 2015 Solution View → 66

Light of wavelength 500nm is incident on a metal with work function 2 . 28eV . The de Broglie wavelength of the emitted electron is:

NEET 2015 Solution View → 67

When a certain metallic surface is illuminated with monochromatic light of wavelength λ, the stopping potential for photoelectric current is 3 V _ 0 and when the same surface is

NEET 2015 Solution View → 68

Which of the following figures represent the variation of particle momentum and the associated de-Broglie wavelength?

NEET 2015 Solution View → 69

Work function of a metal is 5.2 × 10^ -18 , then its threshold wavelength will be

JIPMER 2014 Solution View → 70

Relation between wavelength of photon and electron of same energy is

JIPMER 2014 Solution View → 71

If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle is:

NEET 2014 Solution View → 72

When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from emitted 0.5eV to 0.8eV . The

NEET 2014 Solution View → 73

A transverse wave is represented by the equation y=y_0 (2 π)/(λ)(v t-k) For what value of λ is the particle velocity equal to two times the wave velocity

JIPMER 2013 Solution View → 74

Minimum excitation potential of Bohr's first orbit in hydrogen atom is

JIPMER 2013 Solution View → 75

The work function for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photo, electrons for a radiation of

JIPMER 2013 Solution View → 76

A source of light is placed at a distance of 50 ~cm from a photo cells and the stopping potential is found to be V_ 0^* . If the distance between the light source and photo cells

NEET 2013 Solution View → 77

The de-Broglie wavelength of neutrons in thermal equilibrium at temperature T is:

NEET 2013 Solution View → 78

For photoelectric emission from certain metal the cut-off frequency is v . If radiation of frequency 2 v impinges on the metal plate, the maximum possible velocity of the emitted

NEET 2013 Solution View → 79

The wavelength λ_e of an electron and λ_p of a photon of same energy E are related by

NEET 2013 Solution View → 80

Which one of the following graph represents the variation of maximum kinetic energy (E_k) of the emitted electrons with frequency v in photoelectric effect correctly?

JIPMER 2012 Solution View → 81

A 200 ~W sodium street lamp emits yellow light of wavelength 0.6 μ m . Assuming it to be 25 \% efficient in converting electrical energy to light, the number of photons of yellow

NEET 2012 Solution View → 82

An α -particle moves in a circular path of radius 0.83 ~cm in the presence of a magnetic field of 0.25 ~Wb / m^2 . The de-Broglie wavelength associated with the particle will be

NEET 2012 Solution View → 83

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is

NEET 2012 Solution View → 84

If the momentum of an electron is changed by p , then the de-Broglie wavelength associated with it changes by 0.5 \% . The initial momentum of electron will be

NEET 2012 Solution View → 85

Two radiations of photon energies 1 eV and 2.5 eV , successively illuminate a photosensitive metallic surface of work function 0.5 eV . The ratio of the maximum speeds of the

NEET 2012 Solution View → 86

Light of frequency v falls on material of threshold frequency v_0 . Maximum kinetic energy of emitted electron is proportional to

JIPMER 2011 Solution View → 87

In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by

NEET 2011 Solution View → 88

In photoelectric emission process from a metal of work function 1.8 eV , the kinetic energy of most energetic electrons is 0.5 eV . The corresponding stopping potential is

NEET 2011 Solution View → 89

Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of

NEET 2011 Solution View → 90

Photoelectric emission occurs only when the incident light has more than a certain minimum

NEET 2011 Solution View → 91

Electrons used in an electron microscope are accelerated by a voltage of 25 kV . If the voltage is increased to 100 kV then the de-Broglie wavelength associated with the electrons

NEET 2011 Solution View → 92

The threshold frequency for a photo-sensitive metal is 3.3 × 10^ 14 ~Hz . If light of frequency 8.2 × 10^ 14 ~Hz is incident on this metal, the cut-off voltage for the

NEET 2011 Solution View → 93

An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photo-sensitive material having work function 2.75 eV . If

NEET 2011 Solution View → 94

A source S_1 is producing, 10^ 15 photons/s of wavelength 5000 Å . Another source S_2 is producing 1.02 × 10^ 15 photons per second of wavelength 5100 Å . Then, (power of .S_2)

NEET 2010 Solution View → 95

A beam of cathode rays is subjected to crossed Electric ( E ) and Magnetic fields (B) . The fields are adjusted such that the beam is not deflected. The specific charge of the

NEET 2010 Solution View → 96

When monochromatic radiation of intensity I falls on a metal surface, the number of photoelectron and their maximum kinetic energy are N and T respectively. If the intensity of

NEET 2010 Solution View → 97

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV , when ultraviolet light of 200 ~nm

NEET 2010 Solution View → 98

The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

NEET 2009 Solution View → 99

The number of photoelectrons emitted for light of a frequency v (higher than the threshold frequency v_0 ) is proportional to

NEET 2009 Solution View → 100

The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement ?

NEET 2009 Solution View → 101

Monochromatic light of wavelength 667 ~nm is produced by a helium neon laser. The power emitted is 9 ~mW . The number of photons arriving per second on the average at a target

NEET 2009 Solution View → 102

The number of photoelectrons emitted for light of a frequency v (higher than the threshold frequency v_0 ) is proportional to :

NEET 2009 Solution View → 103

Monochromatic light of wavelength 667 ~nm is produced by a helium neon laser. The power emitted is 9 ~mW . The number of photons arriving per second on the average at a target

NEET 2009 Solution View → 104

Hard X -rays for the study of fractures in bones should have a minimum wavelength of 10^ -11 ~m . The accelerating voltage for electrons in X -ray machine should be

JIPMER 2008 Solution View → 105

In photoelectric effect, the electrons are ejected from metals if the incident light has a certain minimum

JIPMER 2008 Solution View → 106

If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?

JIPMER 2008 Solution View → 107

In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of

NEET 2008 Solution View → 108

The work function of a surface of a photosensitive material is 6.2 eV . The wavelength of the incident radiation for which the stopping potential is 5 ~V lies in the

NEET 2008 Solution View → 109

A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 × 10^6 ~ms^ -1 . The velocity of the particle is (Mass of electron =9.1 × 10^ -31 ~kg )

NEET 2008 Solution View → 110

In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of

NEET 2008 Solution View → 111

The work function of a surface of a photosensitive material is 6.2 eV . The wavelength of the incident radiation for which the stopping potential is 5 ~V lies in the

NEET 2008 Solution View → 112

A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 × 10^6 ~ms^ -1 . The velocity of the particle is (mass of electron =9.1 × 10^ -31 ~kg )

NEET 2008 Solution View → 113

A photosensitive metallic surface has work function, h v_0 . If photons of energy 2 h v_0 fall on this surface, the electrons come out with a maximum velocity of 4 × 10^6 ~m / s .

JIPMER 2007 Solution View → 114

The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV . According to Einstein's equation, the metals which will emit photoelectrons for a radiation of

JIPMER 2007 Solution View → 115

Monochromatic light of frequency 6.0 × 10^ 14 ~Hz is produced by a laser. The power emitted is 2 × 10^ -3 ~W . The number of photons emitted, on the average, by the source per

NEET 2007 Solution View → 116

A 5 watt source emits monochromatic light of wavelength 5000 Å . When placed 0.5 ~m away, it liberates photoclectrons from a photosensitive metallic surface. When the source is

NEET 2007 Solution View → 117

The light rays having photons of energy 1.8 eV are falling on a metal surface having a work function 1 · 2 eV . What is the stopping potential to be applied to stop the emitting

JIPMER 2006 Solution View → 118

A photocell employs photoelectric effect to convert:

NEET 2006 Solution View → 119

When photons of energy h v fall on an aluminium plate (of work function E_0 ), photoelectrons of maximum kinetic energy K are ejected. If the frequency of radiation is doubled

NEET 2006 Solution View → 120

In a discharge tube ionization of enclosed gas is produced due to collisions between:

NEET 2006 Solution View →
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