JEE Questions for Physics Dual Nature Of Radiation And Matter Quiz 1 - MCQExams.com

Photoelectric effect was first successfully explained by
  • Planck
  • Hallwach
  • Hertz
  • Einstein
An X-ray has a wavelength of 0.010 Å. Its momentum is
  • 2.126 × 10–23 kg-m/s
  • 6.626 × 10–22 kg-m/s
  • 3.456 × 10–25 kg-m/s
  • 3.313 × 10–22 kg-m/s
The shortest wavelength of X-rays emitted from an X-ray tube depends on the
  • Current in the tube
  • Voltage applied to the tube
  • Nature of gas in the tube
  • Atomic number of target material
Momentum of a photon of wavelength λ is
  • h/λ
  • 2)
    Physics-Dual Nature of Radiation and Matter-67390.png

  • Physics-Dual Nature of Radiation and Matter-67391.png
  • zero
The wavelength of X-rays is of the order of
  • Centimetre
  • Micron (10–6m)
  • Angstrom (10–10m)
  • Metre
Cathode rays enter a magnetic field making oblique angle with the lines of magnetic induction. What will be the nature of the path followed?
  • Parabola
  • Helix
  • Circle
  • Straight line
The linear momentum of an electron, initially at rest, accelerated through a potential difference of 100 V is
  • 9.1 × 10-24
  • 6.5 × 10-24
  • 5.4 × 10-24
  • 1.6 × 10-24
The resistance of a discharge tube is
  • zero
  • ohmic
  • non-ohmic
  • infinity
What is the de-Broglie wavelength of the electron accelerated through a potential difference of 100 V?
  • 12.27 Å
  • 1.227 Å
  • 0.1227 Å
  • 0.001227 Å
Find the de-Broglie wavelength for a 100 g bullet moving at 900 ms-1.
  • 7.4 ×10 -36 m
  • 7.8 ×10 -37 m
  • 8.2 ×10 -39 m
  • 3.7 ×10 -35 m
λ of a particle is 2000 Å and KE is 1 eV. If its KE is 1 MeV then, its λ is
  • 3 Å
  • 200 Å
  • 2 Å
  • 20 Å
An electron of mass me and a proton of mass mp are moving with the same speed. The ratio of their de-Broglie wavelength λe / λp is
  • 918
  • 1/1836
  • 1836
  • 1
Nuclear radii may be measured by scattering high energy electrons from nuclei. What is the de-Broglie wavelength for 200 MeV electrons ?
  • 8.28 Fm
  • 7.98 Fm
  • 6.45 Fm
  • 6.20 Fm
The de-Broglie wavelength of an electron in the ground state of the hydrogen atom is
  • π r2
  • 2πr
  • πr

  • Physics-Dual Nature of Radiation and Matter-67273.png
The de-Broglie wavelength of a ball of mass 120 g, moving at a speed of 20 m/s is
  • 3.5 × 10 -34 m
  • 2.8 × 10 -34 m
  • 1.2 × 10 -34 m
  • 2.1 × 10 -34 m
What is the de-Broglie wavelength of electron having energy 10 ke V ?
  • 0.12 Å
  • 1.2 Å
  • 12.2 Å
  • None of these
For the Bohr's second orbit of circumference 2πr, the de-Broglie wavelength of revolving electron will be
  • 2πr
  • πr
  • 1 / 2πr
  • 1 / 4πr
In Davisson-Germer experiment, maximum intensity is observed at
  • 50° and 54 V
  • 54° and 50 V
  • 50° and 50 V
  • 65° and 50 V
A photon and an electron have equal energy E.

  • Physics-Dual Nature of Radiation and Matter-67274.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67275.png
  • 1 / E
  • Does not depend upon E
JJ Thomson's experimentally confirmed the existence of matter waves by the phenomenon
  • diffraction
  • refraction
  • polarisation
  • scattering
The kinetic energy of an electron gets tripled, then the de-Broglie wavelength associated with it changes by a factor

  • Physics-Dual Nature of Radiation and Matter-67276.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67277.png

  • Physics-Dual Nature of Radiation and Matter-67278.png
  • 3
If an electron and a proton have the same de-Broglie wavelength, then the kinetic energy of the electron is
  • zero
  • less than that of a proton
  • more than that of a proton
  • equal to that of a proton
Which of the following is not the property of the photons?
  • Momentum
  • Energy
  • Charge
  • Velocity
The de-Broglie wavelength associated with a particle moving with momentum (p) and mass (m) is

  • Physics-Dual Nature of Radiation and Matter-67279.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67280.png

  • Physics-Dual Nature of Radiation and Matter-67281.png

  • Physics-Dual Nature of Radiation and Matter-67282.png
Photon of frequency v has a momentum associated with it. If c is the velocity of light., the momentum is
  • v / c
  • h v c
  • h v / c2
  • h v / c
The momentum of a photon of energy 1 MeV in kg -ms-1 , will be
  • 0.33 × 106
  • 7 × 10-24
  • 10-22
  • 5 × 10-22
The ratio of the de-Broglie wavelength of an α-particle and a proton of same kinetic energy is
  • 1 : 2
  • 1 : 1
  • 1 : √2
  • 4 : 1
An electron is accelerated through a potential difference of V volt The speed of electrons will be

  • Physics-Dual Nature of Radiation and Matter-67283.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67284.png

  • Physics-Dual Nature of Radiation and Matter-67285.png

  • Physics-Dual Nature of Radiation and Matter-67286.png
If α, β and γ rays carry same momentum, which has the longest wavelength ?
  • α–rays
  • β–rays
  • γ–rays
  • None, all have same wavelength
If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor

  • Physics-Dual Nature of Radiation and Matter-67287.png
  • 2

  • Physics-Dual Nature of Radiation and Matter-67288.png

  • Physics-Dual Nature of Radiation and Matter-67289.png
The de-Broglie wavelength of an electron is the same as that of a 50 keV X-ray photon. The ratio of the energy of the photon to the kinetic energy of the electron is (the energy equivalent of electron mass is 0.5 MeV)
  • 1 : 50
  • 1 : 2
  • 20 : 1
  • 50 : 1
If a source of power 4 kW produces 1020 photon/sec the radiation belong to a part of the spectrum called
  • X–rays
  • ultraviolet rays
  • microwaves
  • γ–rays
The energy of an X–ray photon of wavelength 1 Å is (h = 6.6 × 10-34 J-s)
  • 24.6 keV
  • 6.1 keV
  • 12.3 keV
  • 1.2 keV
Which of the following supports the wave nature of X-rays?
  • Photoelectric effect
  • Photosynthesis
  • Compton scattering
  • Diffraction
The potential difference applied to an X-ray tube is 5 kV, and the current through it is 3.2 mA. The number of electrons striking the target per sec is
(take, e =1.6 × 10-19 C)
  • 1.6 × 106
  • 2 × 10-6
  • 4 × 1016
  • 2 × 1016
X-rays are diffracted from a crystal of lattice plane spacing 2Å. The maximum wavelength that can be diffracted is
  • 1 Å
  • 2 Å
  • 2.5 Å
  • 4 Å
X-rays of wavelength λ = 2 Å is emitted from the metal target. The potential difference applied across the cathode and the metal target is
  • 5525 V
  • 320 V
  • 6200 V
  • 3250 V
The maximum kinetic energy of the photoelectrons depends only on
  • potential
  • frequency
  • incident angle
  • pressure
Find the maximum wavelength of the light that will excite an electron in the valence band of diamond to the conduction band. The energy gap is 5.5 eV.
  • 225 nm
  • 315 nm
  • 352 nm
  • 412 nm
Which of the following device is the application of photoelectric effect ?
  • Light emitting diode
  • Diode
  • Photocell
  • Transistor
What should be the velocity of an electron so that, its momentum becomes equal to that of a photon of wavelength 5200 Å ?
  • 700 m/s
  • 1000 m/s
  • 1400 m/s
  • 2800 m/s
The work function for aluminium is 4.125 eV. The cut-off wavelength for photoelectric effect for aluminium will be
  • 420 nm
  • 350 nm
  • 300 nm
  • 200 nm
Calculate the linear momentum of a 3 MeV photon
  • 0.01 eV–s/m
  • 0.02 eV–s/m
  • 0.03 eV–s/m
  • 0.0 eV–s/m
The photoelectric effect represents that
  • light has a particle nature
  • electron has a wave nature
  • proton has a wave nature
  • None of the above
The linear momentum of photon is p. The wavelength of photon is λ , then (h is Planck's constant)
  • λ = hp
  • 2)
    Physics-Dual Nature of Radiation and Matter-67292.png

  • Physics-Dual Nature of Radiation and Matter-67293.png

  • Physics-Dual Nature of Radiation and Matter-67294.png
Which of the following event, support the quantum nature of light ?
  • Diffraction
  • Polarisation
  • Interference
  • Photoelectric effect
The photons in a radiowave of wavelength 3 × 104 cm have energy
  • 6.62 × 10-10 J
  • 19.86 × 10-24 J
  • 6.62 × 10-28 J
  • 2.2 × 10-35 J
The average energy of the Planck oscillator is
  • hv
  • 2)
    Physics-Dual Nature of Radiation and Matter-67295.png

  • Physics-Dual Nature of Radiation and Matter-67296.png
  • kT
In photoelectric effect, if the intensity of light is doubled, then maximum kinetic energy of photoelectrons will become
  • double
  • half
  • four times
  • no change
The maximum kinetic energy of emitted electrons in a photoelectric effect does not depend upon
  • wavelength
  • frequency
  • intensity
  • work function
0:0:1


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