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Dual Nature of Radiation and Matter

Physics

Previous Years Questions

MCQ (Single Correct Answer)

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When two monochromatic lights of frequency, v and $${v \over 2}$$ are incident on a photoelectric metal, their stopping ...
NEET 2022
A radioactive nucleus $$_Z^AX$$ $$\to$$ $${}_{Z - 1}B$$ $$\to$$ $${}_{Z - 3}C$$ $$\to$$ $${}_{Z - 2}D$$, where Z is the ...
NEET 2021
An electromagnetic wave of wavelength '$$\lambda$$' is incident on a photosensitive surface of negligible work function....
NEET 2021
The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600nm, when it...
NEET 2021
An electron is accelerated from rest through a potential difference of V volt. If the de-Broglie wavelength of the elect...
NEET 2020 Phase 1
Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoele...
NEET 2020 Phase 1
An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is (nearly) : (me = 9 ...
NEET 2019
When the light of frequency 2$${\upsilon _0}$$ (where $${\upsilon _0}$$ is threshold frequency), is incident on a meta...
NEET 2018
An electron of mass m with an initial velocity $$\overrightarrow v = {v_0}\widehat i$$ (v0 > 0) enters an electric ...
NEET 2018
The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (kelvin) and mass m, i...
NEET 2017
An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is
NEET 2016 Phase 1
When a metallic surface is illuminated with radiation of wavelength $$\lambda $$, the stopping potential is V. If the sa...
NEET 2016 Phase 1
Electrons of mass m with de-Broglie wavelength $$\lambda $$ fall on the target in an X-ray tube. The cutoff wavelength (...
NEET 2016 Phase 2
Photons with energy 5 eV are incifent on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectro...
NEET 2016 Phase 2
Which of the following figures represent the variation of particle momentum and the associated de-Broglie wavelength?
AIPMT 2015 Cancelled Paper
A certain metallic surface is illuminated with monochromatic light of wavelength, $$\lambda .$$ The stopping potential f...
AIPMT 2015 Cancelled Paper
A photoelectric surface is illuminated successively by monochromatic light of wavelength $$\lambda $$ and If the maximum...
AIPMT 2015
Light of wavelength 500 nm is incifent on a metal with work function 2.28 eV. The de Broglie wavelength of the emitted e...
AIPMT 2015
If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de Brogl...
AIPMT 2014
When the energy of the incident radiation is increased nby 20%, the kinetic energy of the photoelectrons emitted from a ...
AIPMT 2014
The de-broglie wavelength of neutrons in thermal equilibrium at temperature T is
NEET 2013 (Karnataka)
The wavelength $$\lambda $$e of an electron and $$\lambda $$p of a photon of same energy E are related by ...
NEET 2013
A source of light is placed at a distance of 50 cm from a photo cell and the stopping potential is found to be V0. If th...
NEET 2013 (Karnataka)
For photoelectric emission from certain metal the cutoff frequency is $$\upsilon $$. If radiation of frequency 2$$\upsil...
NEET 2013
An $$\alpha $$-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m2. Th...
AIPMT 2012 Prelims
If the momentum of an electron is changed by P, then the de Broglie wavelength associated with changes by 0.5%. The init...
AIPMT 2012 Mains
Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work fu...
AIPMT 2012 Mains
A 200 W sodium street lamp emits yellow light of wavelength 0.6 $$\mu $$m. Assuming it to be 25% efficient in converting...
AIPMT 2012 Prelims
Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a...
AIPMT 2012 Prelims
The threshold frequency for a photosensitive metal is 3.3 $$ \times $$ 1014 Hz. If light of frequency 8.2 $$ \times $$ 1...
AIPMT 2011 Mains
In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons i...
AIPMT 2011 Prelims
Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV th...
AIPMT 2011 Prelims
Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surfac...
AIPMT 2011 Prelims
Photoelectric emission occurs only when the incident light has more than a certain minimum
AIPMT 2011 Prelims
In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by
AIPMT 2011 Prelims
The electron in the hydrogen atom jumps from excited state (n = 3) to its ground state (n = 1) and the photons thus emit...
AIPMT 2010 Mains
A source S1 is producing, 1015 photons per second of wavelength 5000 $$\mathop A\limits^ \circ $$. Another source S2 is...
AIPMT 2010 Prelims
The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having wor...
AIPMT 2010 Prelims
When monochromatic radiation of intensity $$I$$ falls on a metal surface, the number of photoelectrons and their maximum...
AIPMT 2010 Mains
A beam of cathode rays is subjected to crossed electric (E) and magnetic fields (B). The fields are adjusted such that t...
AIPMT 2010 Prelims
The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiat...
AIPMT 2009
Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW. The number of ph...
AIPMT 2009
The number of photo electrons emitted for light of a frequency $$\upsilon $$ (higher than the threshold frequency $${\up...
AIPMT 2009
In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result...
AIPMT 2008
The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for whic...
AIPMT 2008
A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 $$ \times $$ 106 m s$$-$$1. T...
AIPMT 2008
Monochromatic light of frequency 6.0 $$ \times $$ 1014 Hz is produced by a laser. The power emitted is 2 $$ \times $$ 10...
AIPMT 2007
A beam of electron passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field...
AIPMT 2007
A 5 watt source emits monochromatic light of wavelength 5000 $$\mathop A\limits^ \circ $$. When placed 0.5 m away, it l...
AIPMT 2007
In a discharge tube ionization of enclosed gas is produced due to collisions between
AIPMT 2006
The momentum of a photon of energy 1 MeV in kg m/s will be
AIPMT 2006
A photocell employs photoelectric effect to convert
AIPMT 2006
When photons of energy h$$\upsilon $$ fall on an aluminimum plate (of work function E0), photoelectrons of maximum kinet...
AIPMT 2006
A photosensitive metallic surface has work function, h$$\upsilon $$0. If photons of energy $$2h{\upsilon _0}$$ fall on t...
AIPMT 2005
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...
AIPMT 2005
According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the f...
AIPMT 2004
J.J. Thomson's cathode-ray tube experiment demonstrated that
AIPMT 2003
A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then
AIPMT 2003
The value of Planck's constant is
AIPMT 2002
If particles are moving with same velocity, then which has maximum de Broglie wavelength?
AIPMT 2002
When ultraviolet rays incident on metal plate then photoelectric effect does not occur, it occurs by incidence of
AIPMT 2002
Which of the following is not the property of cathode rays ?
AIPMT 2002
A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance become ...
AIPMT 2001
Which one among the following shows particle nature of light?
AIPMT 2001
In Thomson mass spectrograph $$\overrightarrow E \bot \overrightarrow B $$ then the velocity of electron beam will be
AIPMT 2001
Who evaluated the mass of electron infirectly with help of charge
AIPMT 2000
By photoelectric effect, Einstein proved
AIPMT 2000

MCQ (More than One Correct Answer)

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The photoelectric threshold wavelength of silver is 3250 $$ \times $$ 10$$-$$10 m. The velocity of the electron ejected ...
NEET 2017

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