JEE Questions for Physics Dual Nature Of Radiation And Matter Quiz 9 - MCQExams.com

In a Thomson set-up for the determination of e/m, electrons accelerated by 2.5 kV enter the region of crossed electric and magnetic fields of strengths 3.6 × 104 Vm–1 and 1.2 × 10–3 T respectively and go through undeflected. The measured value of elm of the electron is equal to
  • 1.0 × 1011C – kg–1
  • 1.76 × 1011C – kg–1
  • 1.80 × 1011C – kg–1
  • 1.85 × 1011C – kg–1
The ratio of specific charge of an α-particle to that of a proton is
  • 2 : 1
  • 1 : 1
  • 1 : 2
  • 1 : 3
In an electron gun, the electrons are accelerated by the potential V. If e is the charge and m is the mass of an electron, then the maximum velocity of these electrons will be

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    Physics-Dual Nature of Radiation and Matter-67713.png

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  • Physics-Dual Nature of Radiation and Matter-67715.png
If an electron oscillates at a frequency of 1 GHz it gives
  • X-rays
  • Mirowaves
  • Infrared rays
  • None of these
In a discharge tube at 0.02 mm, there is a formation of
  • FDS
  • CDS
  • Both space
  • None of these
Electric field and magnetic field in Thomson mass spectrograph are applied
  • Simultaneously, perpendicular
  • Perpendicular but not simultaneously
  • Parallel but not simultaneously
  • Parallel simultaneously
The current conduction in a discharged tube is due to
  • Electrons only
  • +ve ions and electrons
  • –ve ions and electrons
  • +ve ions, –ve ions and electrons
In Millikan\'s oil drop experiment, a charged drop falls with terminal velocity V. If an electric field E is applied in vertically upward direction then it starts moving in upward direction with terminal velocity 2V. If magnitude of electric field is decreased to E/2, then terminal velocity will become
  • V/2
  • V
  • 3V/2
  • 2 V

Physics-Dual Nature of Radiation and Matter-67719.png
  • 2Ee /3m
  • 3Ee /2m
  • 2 m/3Ee
  • 3 m/2Ee
An electron is moving in electric field and magnetic field it will gain energy from
  • Electric field
  • Magnetic field
  • Both of these
  • None of these
Positive rays were discovered by
  • Thomson
  • Goldstein
  • W. Crookes
  • Rutherford
The kinetic energy of an electron gets tripled, then the de-Broglie wavelength associated with it changes by a factor

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    Physics-Dual Nature of Radiation and Matter-67722.png

  • Physics-Dual Nature of Radiation and Matter-67723.png
  • 3
G.P. Thomson experimentally confirmed the existence of matter waves by the phenomena
  • Diffraction
  • Refraction
  • Polarisation
  • Scattering
The de-Broglie wavelength associated with the particle of mass m moving with velocity v is
  • h/mv
  • mv/h
  • mh/v
  • m/hv
A photon, an electron and a uranium nucleus all have the same wavelength. The one with the most energy
  • Is the photon
  • Is the electron
  • Is the uranium nucleus
  • Depends upon the wavelength and the properties of the particle
In Davisson-Germer experiment maximum intensity is observed at
  • 50° and 54 Volt
  • 54° and 50 Volt
  • 50° and 50 Volt
  • 65° and 50 Volt
Dual nature of radiation is shown by
  • Diffraction and reflection
  • Refraction and diffraction
  • Photoelectric effect alone
  • Photoelectric effect and diffraction
For the Bohr\'s first orbit of circumference 2πr, the de-Broglie wavelength of revolving electron will be
  • 2πr
  • πr

  • Physics-Dual Nature of Radiation and Matter-67728.png

  • Physics-Dual Nature of Radiation and Matter-67729.png
An electron of mass m when accelerated through a potential difference V has de-Broglie wavelength λ. The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be

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    Physics-Dual Nature of Radiation and Matter-67732.png

  • Physics-Dual Nature of Radiation and Matter-67733.png

  • Physics-Dual Nature of Radiation and Matter-67734.png
What will be the ratio of de-Broglie wavelengths of proton and α-particle of same energy ?
  • 2 : 1
  • 1 : 2
  • 4 : 1
  • 1 : 4
What is the de-Broglie wavelength of the α-particle accelerated through a potential difference V

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  • 2)
    Physics-Dual Nature of Radiation and Matter-67738.png

  • Physics-Dual Nature of Radiation and Matter-67739.png

  • Physics-Dual Nature of Radiation and Matter-67740.png
de-Broglie hypothesis treated electrons as
  • Particles
  • Waves
  • Both 'a' and `b'
  • None of these
Which phenomenon best supports the theory that matter has a wave nature?
  • Electron momentum
  • Electron diffraction
  • Photon momentum
  • Photon diffraction
The kinetic energy of electron and proton is 10–32 J. Then the relation between their de-Broglie wavelengths is
  • λp< λe
  • λp > λe
  • λp = λe
  • λp = 2 λe
The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is
  • 0.168 eV
  • 16.8 eV
  • 1.68 eV
  • 2.5 eV
The wavelength of de-Broglie wave is 2µm, then its momentum is (h = 6.63 × 10–34 J–s)
  • 3.315 × 10–28 kg-m/s
  • 1.66 × 10–28 kg-m/s
  • 4.97 × 10–28 kg-m/s
  • 9.9 × 10–28 kg-m/s
Davisson and Germer experiment proved
  • Wave nature of light
  • Particle nature of light
  • Both (a) and (b)
  • Neither (a) nor (b)
If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor

  • Physics-Dual Nature of Radiation and Matter-67745.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67746.png
  • 1/2
  • 2
The de-Broglie wavelength of an atom at absolute temperature T K will be

  • Physics-Dual Nature of Radiation and Matter-67748.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67749.png

  • Physics-Dual Nature of Radiation and Matter-67750.png

  • Physics-Dual Nature of Radiation and Matter-67751.png
The de-Broglie wavelength of the electron in the ground state of the hydrogen atom is…. (radius of the first orbit of hydrogen atom = 0.53 Å)
  • 1.67 Å
  • 3.33 Å
  • 1.06 Å
  • 0.53 Å
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 sun radiates energy at the rate of 3.77 × 1026 J/s. The loss of mass it suffers per seconds is
  • 41.9 × 1018 g
  • 41.9 × 108 kg
  • 1.29 × 1016 kg
  • 1.29 × 1010 kg
The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is (hc = 1240 eV. nm)
  • 3.09 eV
  • 1.43 eV
  • 1.51 eV
  • 1.68 eV
If the momentum of a photon is p, then its frequency is Where m is the rest mass of the photon

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    Physics-Dual Nature of Radiation and Matter-67758.png

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Physics-Dual Nature of Radiation and Matter-67762.png
  • E/p
  • Ep

  • Physics-Dual Nature of Radiation and Matter-67763.png
  • 3 × 108 m/s
An important spectral emission line has a wavelength of 21 cm. The corresponding photon energy is (h = 6.62 × 10–34 Js; c = 3 × 108 m/s)
  • 5.9 × 10–4 eV
  • 5.9 × 10–6 eV
  • 5.9 × 10–8 eV
  • 11.8 × 10–6 eV
The momentum of a photon in an X-ray beam of 10–10 metre wavelength is
  • 1.5 × 10–23 kg-m/s
  • 6.6 × 10–24 kg-m/s
  • 6.6 × 10–44 kg-m/s
  • 2.2 × 10–52 kg-m/s
The energy of a photon of light with wavelength 5000 Å is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1 Å would be
  • 2.5/5000 eV
  • 2.5/(5000)2 eV
  • 2.5 × 5000 eV
  • 2.5 × (2 eV
Energy of a quanta of frequency 1015 Hz and h = 6.6 × 10–34 J-s will be
  • 6.6 × 10–19 J
  • 6.6 × 10–12 J
  • 6.6 × 10–49 J
  • 6.6×10–41 J
Wavelength of a 1 keV photon is 1.24 × 10–9 m. What is the frequency of 1 MeV photon
  • 1.24 × 1015 Hz
  • 2.4 × 1020 Hz
  • 1.24 × 1018 Hz
  • 2.4 × 1023 Hz
What is the momentum of a photon having frequency 1.5 × 1013 Hz?
  • 3.3 × 10–29 kg m/s
  • 3.3 × 10–34 kg m/s
  • 6.6 × 10–34 kg m/s
  • 6.6 × 10–30 kg m/s
Which of the following statements is not correct?
  • Photographic plates are sensitive to infrared rays
  • Photographic plates are sensitive to ultraviolet rays
  • Infra-red rays are invisible but can cast shadows like visible light
  • Infrared photons have more energy than photons of visible light
If we express the energy of a photon in KeV and the wavelength in angstroms, then energy of a photon can be calculated from the relation
  • E= 12.4 hv
  • E =12.4 h/λ
  • E = 12.4 / λ
  • E = hv
A photon of wavelength 4400 Å is passing through vacuum. The effective mass and momentum of the photon are respectively.
  • 5 × 10–36 kg, 1.5×10–27 kg-m/s
  • 5 × 10–35 kg, 1.5 × 10–26 kg-m/s
  • Zero, 1.5 x 10–26 kg-m/s
  • 5 × 10–36 kg, 1.67 × 10–43 kg-m/s
Which of the following is true for photon?

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    Physics-Dual Nature of Radiation and Matter-67775.png

  • Physics-Dual Nature of Radiation and Matter-67776.png

  • Physics-Dual Nature of Radiation and Matter-67777.png
Which of the following is incorrect statement regarding photon?
  • Photon exerts no pressure
  • Photon energy is hv
  • Photon rest mass is zero
  • None of the above
If a photon has velocity c and frequency v, then which of following represents its wavelength

  • Physics-Dual Nature of Radiation and Matter-67778.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67779.png

  • Physics-Dual Nature of Radiation and Matter-67780.png
  • hv
Monochromatic light of frequency f incident on emitter having threshold frequency f0. The kinetic energy of ejected electron will be
  • hf
  • h(f – f0)
  • hf0
  • h(f + f0)
There are n1 photons of frequency γ1 in a beam of light. In an equally energetic beam, there are n2 photons of frequency γ2. Then the correct relation is

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    Physics-Dual Nature of Radiation and Matter-67784.png

  • Physics-Dual Nature of Radiation and Matter-67785.png

  • Physics-Dual Nature of Radiation and Matter-67786.png

Physics-Dual Nature of Radiation and Matter-67788.png
  • Kinetic energy of all the emitted electrons
  • Mean kinetic energy of the emitted electrons
  • Maximum kinetic energy of the emitted electrons
  • Minimum kinetic energy of the emitted electrons
0:0:1


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