Quantrex Academy Quantrex AcademyPYQs with solutions · JEE · NEET · NDA

Home · NEET UG · Physics · Dual Nature of Matter

Dual Nature of Matter — NEET UG Physics PYQs

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

377 questionsPhysicsSolutions on every page
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 _e of an electron and _P of a photon of same energy E are related as

MHT CET Medical 2026 Solution View → 4

A light of wavelength ( < 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 required wa

MHT CET Medical 2026 Solution View → 5

The de Broglie wavelength of an electron with kinetic energy K₁ is ₁ . If the kinetic energy increases to 5K₁ , the new wavelength is ₂ = x 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_ max ) against frequency ( ) 2. Stopping potential ( V_o ) against

MHT CET Medical 2026 Solution View → 7

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

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 4 ₀ is incident on the metal of threshold frequency 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 . The electrons are produced by using an electron-gun ha

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 ' ' and the frequency of incident light is ' ', there is no emission of photoelectrons if

MHT CET Medical 2026 Solution View → 13

The de-Broglie wavelength of the free electron is ' ' and has a kinetic energy E_k . If the kinetic energy of the free electron is made double, the new de-Broglie wavelength is ' ₁

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 _p of a photon is four times the de-Broglie wavelenght _e of an electron, the

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 ' '. If a proton of a mass ' M ' is accelerated throu

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 ( _e _p ) is c = velocity of light

MHT CET Medical 2026 Solution View → 18

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

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 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, then

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 effec

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 = h I. de Broglie wavelength B. Diffraction and Interference II. Particle nature of light C. = h/p III. Wave nature of light D. Comp

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 photo

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 =3 10

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 10⁻³⁴

NEET 2026 Solution View → 27

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

NEET 2026 Solution View → 28

A photon and an electron (mass m ) have the same energy E . The ratio ( _ photon / _ 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 . C.

NEET 2024 Solution View → 31

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

NEET 2024 Solution View → 32

An electron and an alpha particle are accelerated by the same potential difference. Let _ and _a denote the de-Broglie wavelengths of the electron and the alpha particle, respectiv

NEET 2024 Solution View → 33

The graph which shows the variation of ( 1 ^2 ) and its kinetic energy, E is (where 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 ( C s ) , Potassium ( K ) and Sodium ( N a ) 2 . 14 &#160; eV , &#160; 2 . 30 &#160; eV &#160; and &#160; 2 . 75 &#160; eV are respectively. If incide

NEET 2023 Solution View → 37

The minimum wavelength of X -rays produced by an electron accelerated through a potential difference of &#160; 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 v₀ . If light of frequency 4 v₀ 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 &#955; of a particle and its associated momentum p is :

NEET 2022 Solution View → 41

When two monochromatic lights of frequency, &#957; and &#957; 2 are incident on a photoelectric metal, their stopping potential becomes V S 2 and V s respectively. The threshold fr

NEET 2022 Solution View → 42

An electromagnetic wave of wavelength &#955; is incident on a photosensitive surface of negligible work function. If m mass is of photoelectron emitted from the surface has de-Brog

NEET 2021 Solution View → 43

The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 &#160; nm , when it delivers the power of 3 . 3 &#215; 10 - 3 &#160; W

NEET 2021 Solution View → 44

The de-Broglie wavelength of an electron moving with kinetic energy of 144 &#160; eV 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 &#215; 10 &#8211; 2 &#160; nm , the potential d

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 do

NEET 2020 Solution View → 47

If frequency of a photon is 6 10¹⁴ ~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 -particle are accelerated from rest to the same energy. The de-Broglie wavelengths _p and _ are in the ratio

NEET 2019 Solution View → 51

An electron is accelerated through a potential difference of 10,000 &#160; V . Its de Broglie wavelength is (nearly): m e = 9 &#215; 1 0 - 31 &#160; k g

NEET 2019 Solution View → 52

An electron of mass m with an initial velocity V &#8594; = V 0 &#8201; i ^ &#8201; &#8201; ( V 0 &#62; 0 ) enters in an electric field E &#8594; = -E 0 i ^ ( E 0 &#62; 0 and is a c

NEET 2018 Solution View → 53

When the light of frequency 2 &#957; 0 (where &#957; 0 is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is v 1 . When the frequency

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 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 mass m

JIPMER 2017 Solution View → 56

The photoelectric threshold wavelength of silver is 3250 &#215; 10 &#8211; 10 &#160; m . The velocity of the electron ejected from a silver surface by ultraviolet light of waveleng

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 and stopping potential (V) of three metals having work function ₁, ₂ and ₃ in an experiment of photoelectric effect is plotted as shown in the figure. Which one of the

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 d

JIPMER 2016 Solution View → 60

Electrons of mass, m with de-Broglie wavelength, &#955; fall on the target in an X-ray tube. The cutoff wavelength, &#955; 0 of the emitted X-ray is

NEET 2016 Solution View → 61

Photons with energy of 5 &#160; eV are incident on a cathode, C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 &#160; eV ar

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 &#955; , the stopping potential is V . If the same surface is illuminated with radiation of wavelength 2 &#955;

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 &#955; and &#955; 2 . If the maximum kinetic energy of the emitted photoelectrons in the se

NEET 2015 Solution View → 66

Light of wavelength 500 &#160; nm is incident on a metal with work function 2 . 28 &#160; eV . 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 &#955; , the stopping potential for photoelectric current is 3 V 0 and when the same surface i

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 0.5 &#160; e V to 0.8

NEET 2014 Solution View → 73

A transverse wave is represented by the equation y=y₀ 2 (v t-k) For what value of 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 e

NEET 2013 Solution View → 79

The wavelength _e of an electron and _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 m . Assuming it to be 25 % efficient in converting electrical energy to light, the number of photons of yellow ligh

NEET 2012 Solution View → 82

An -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 measured

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 emitt

NEET 2012 Solution View → 86

Light of frequency v falls on material of threshold frequency v₀ . 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 maxim

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 10¹⁴ ~Hz . If light of frequency 8.2 10¹⁴ ~Hz is incident on this metal, the cut-off voltage for the photo-electric emiss

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, 10¹⁵ photons/s of wavelength 5000 Å . Another source S₂ is producing 1.02 10¹⁵ photons per second of wavelength 5100 Å . Then, (power of .S₂ ) / ( . powe

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 cath

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 rad

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 falls

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 v₀ ) 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 irra

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 irra

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 v₀ . If photons of energy 2 h v₀ fall on this surface, the electrons come out with a maximum velocity of 4 10^6 ~m / s . When

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 10¹⁴ ~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 second is:

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 mov

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 elec

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 E₀ ), photoelectrons of maximum kinetic energy K are ejected. If the frequency of radiation is doubled, the

NEET 2006 Solution View → 120

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

NEET 2006 Solution View →
Practice all Dual Nature of Matter questions in the app →