JEE Questions for Physics Dual Nature Of Radiation And Matter Quiz 19 - MCQExams.com

In order to coincide the parabolas formed by singly ionized ions in one spectrograph and doubly ionized ions in the other Thomson\'s mass spectrograph, the electric fields and magnetic fields are kept in the ratios 1 : 2 and 3 : 2 respectively. Then the ratio of masses of the ions is
  • 3 : 4
  • 1 : 3
  • 9 : 4
  • None of these
Let λα,λβand λ\'α denote the wavelengths of the X-rays of the Kα, Kβ and Lα, lines in the characteristic X-rays for a metal. Then
  • λα>λ’α>λβ
  • λ’α>λβ>λα

  • Physics-Dual Nature of Radiation and Matter-68391.png

  • Physics-Dual Nature of Radiation and Matter-68392.png
Which of the following figure represents the variation of particle momentum and the associated de-Broglie wavelength?

  • Physics-Dual Nature of Radiation and Matter-68395.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68396.png

  • Physics-Dual Nature of Radiation and Matter-68397.png

  • Physics-Dual Nature of Radiation and Matter-68398.png
According to Einstein\'s photoelecric equation the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is

  • Physics-Dual Nature of Radiation and Matter-68400.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68401.png

  • Physics-Dual Nature of Radiation and Matter-68402.png

  • Physics-Dual Nature of Radiation and Matter-68403.png
For the photoelectric effect, the maximum kinetic energy Ekof the emitted photoelectrons is plotted against the frequency v of the incident photons as shown in the figure. The slope of the curve gives
Physics-Dual Nature of Radiation and Matter-68405.png
  • Charge of the electron
  • Work function of the metal
  • Planck's constant
  • Ratio of the Planck's constant to electronic charge
The stopping potential V for photoelectric emission from a metal surface is plotted along Y-axis and frequency v of incident light along X-axis. A straight line is obtained as shown. Planck\'s constant is given by
Physics-Dual Nature of Radiation and Matter-68407.png
  • Slope of the line
  • Product of slope on the line and charge on the electron
  • Product of intercept along Y-axis and mass of the electron
  • Product of slope and mass of electron
In an experiment on photoelectric effect the frequency f of the incident light is plotted against the stopping potential V0. The work function of the photoelectric surface is given by (e is electronic charge)
Physics-Dual Nature of Radiation and Matter-68409.png
  • OB × e in eV
  • OB in volt
  • OA in eV
  • The slope of the line AB
The stopping potential as a function of the frequency of the incident radiation is plotted for two different photoelectric surfaces A and B. The graphs show that work function of A is
Physics-Dual Nature of Radiation and Matter-68411.png
  • Greater than that of B
  • Smaller than that of B
  • Equal to that of B
  • No inference can be drawn about their work functions from the given graphs
The value of stopping potential in the following diagram
Physics-Dual Nature of Radiation and Matter-68416.png
  • – 4 V
  • – 3 V
  • – 2 V
  • – 1 V
In the following diagram if V2> V1then
Physics-Dual Nature of Radiation and Matter-68417.png

  • Physics-Dual Nature of Radiation and Matter-68418.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68419.png

  • Physics-Dual Nature of Radiation and Matter-68420.png

  • Physics-Dual Nature of Radiation and Matter-68421.png
A point source of light is used in an experiment on photoelectric effect. Which of the following curves best represent the variation of photo current (i) with distance (d) of the source from the emitter?
Physics-Dual Nature of Radiation and Matter-68423.png
  • a
  • b
  • c
  • d
The stopping potential (V0) versus frequency (v) plot of a substance is shown in figure the threshold wave length is
Physics-Dual Nature of Radiation and Matter-68425.png
  • 5 × 1014 m
  • 6000 Å
  • 5000 Å
  • Cannot be estimated from given data
The correct graph between the maximum energy of a photoelectron and the inverse of wavelength of the incident radiation is given by the curve
Physics-Dual Nature of Radiation and Matter-68432.png
  • A
  • B
  • C
  • None of these
The continuous X-ray spectrum obtained from a Coolidge tube is of the form

  • Physics-Dual Nature of Radiation and Matter-68434.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68435.png

  • Physics-Dual Nature of Radiation and Matter-68436.png

  • Physics-Dual Nature of Radiation and Matter-68437.png
The dependence of the short wavelength limit min on the accelerating potential V is represented by the curve of figure
Physics-Dual Nature of Radiation and Matter-68439.png
  • A
  • B
  • C
  • None of these
The variation of wavelength λ of the Kα line with atomic number Z of the target is shown by the following curve of
Physics-Dual Nature of Radiation and Matter-68441.png
  • A
  • B
  • C
  • None of these
The difference of kinetic energy of photo electrons emitted from a surface wavelength 2500 Å and 5000 Å will be
  • 1.98 × 10–19 J
  • 1.98 × 10–19 eV
  • 3.96 × 10–19 eV
  • 3.96× 10–19 J
In the graph given below. If the slope is 4.12 × 10–15 V–s, then value of \'h\' should be
Physics-Dual Nature of Radiation and Matter-68443.png
  • 6.6 × 10–31 J-s
  • 6.6 × 10–34 J-s
  • 9.1 × 10–31 J-s
  • None of these
The curves (a), (b), (c) and (d) show the variation between the applied potential difference (V) and the photoelectric current (i), at two different intensities of light (I1>I2). In which figure is the correct variation shown?

  • Physics-Dual Nature of Radiation and Matter-68445.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68446.png

  • Physics-Dual Nature of Radiation and Matter-68447.png

  • Physics-Dual Nature of Radiation and Matter-68448.png
The log-log graph between the energy E of an electron and its de-Broglie wavelength λ will be

  • Physics-Dual Nature of Radiation and Matter-68455.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68456.png

  • Physics-Dual Nature of Radiation and Matter-68457.png

  • Physics-Dual Nature of Radiation and Matter-68458.png
In the diagram a graph between the intensity of X-rays emitted by a molybdenum target and the wavelength is shown, when electrons of 30 keV are incident on the target. In the graph one peak is of Kα line and the other peak is of Kβ line
Physics-Dual Nature of Radiation and Matter-68465.png
  • First peak is of Kα, line at 0.6 Å
  • Highest peak is of Kα line at 0.7 Å
  • If the energy of incident particles is increased, then the peaks will shift towards left
  • If the energy of incident particles is increased, then the peaks will shift towards right
The maximum value of stopping potential in the following diagram is
Physics-Dual Nature of Radiation and Matter-68467.png
  • – 4V
  • – 1V
  • – 3V
  • – 2V
In a parabola spectrograph, the velocities of four positive ions P,Q,Rand S are v1, v2, v3 and v4respectively. Then
Physics-Dual Nature of Radiation and Matter-68469.png
  • v1> v2> v3> v4
  • v1< v2< v3< v4
  • v1< v2< v3< v4
  • v1<2>v3< v4
In Thomson spectrograph experiment, four positive ions P, Q, R and S are situated on Y-X curve a shown in the figure
Physics-Dual Nature of Radiation and Matter-68471.png
  • The specific charge of R and S are same
  • The masses of P and S are same
  • The specific charges of Q and R are same
  • The velocities of R and S are same
The slope of frequency of incident light and stopping potential graph for a given surface will be
  • h
  • h /e
  • eh
  • e
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?
Physics-Dual Nature of Radiation and Matter-68473.png
  • Curves (a) and (b) represent incident radiations of different frequencies and different intensities
  • Curves (a) and (b) represent incident radiations of same frequency but of different intensities
  • Curves (b) and (c) represent incident radiations of different frequencies and different intensities
  • Curves (b) and (c) represent incident radiations of same frequency having same intensity
Irreducible area a b c d, in figure is
Physics-Dual Nature of Radiation and Matter-68474.png
  • Work
  • Planck's constant
  • Joule
  • Charge
Assertion The energy (E) and momentum (p) of a photon are related by p = E /c.
Reason The photon behaves like a particle.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Photoelectric effect demonstrates the wave nature of light.
Reason The number of photo electrons is proportional to the frequency of light.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion When the speed of an electron increases its specific charge decreases.
Reason Specific charge is the ratio of the charge to mass.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion X-rays travel with the speed of light.
Reason X-rays are electromagnetic rays.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Mass of moving photon varies inversely as the wavelength.
ReasonEnergy of the particle = Mass × (Speed of light)2
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
AssertionKinetic energy of photo electrons emitted by a photosensitive surface depends upon the intensity of incident photon.
Reason The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Separation of isotope possible because of the difference in electron numbers of isotope.
Reason Isotope of an element can be separated by using a mass spectrometer.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The specific charge of positive rays is not universal constant.
Reason The mass of ions varies with speed.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Photo sensitivity of a meal is high if its work function is small.
Reason Work function = hf0 where f0 is the threshold frequency.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The de-Broglie wavelength of a molecule varies inversely as the square root of temperature.
Reason The root mean square velocity of the molecule depends on the temperature.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion An electron is not deflected on passing through certain region of space. This observation confirms that there is no magnetic field in that region.
Reason The deflection of electron depends on angle between velocity of electron and direction of magnetic field.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Electric conduction in gases is possible at normal pressure.
Reason The electric conduction in gases depends only upon the potential difference between the electrodes.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Light is produced in gases in the process of electric discharge through them at high pressure.
ReasonAt high pressure electrons of gaseous atoms collide and reach and excited state.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The photo electrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies.
Reason The work function of the metal varies as a function of depth from the surface.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion An electric field is preferred in comparison to magnetic field for detecting the electron beam in a television picture tube.
Reason Electric field requires low voltage.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The specific charge for positive rays is a characteristic constant.
Reason The specific charge depends on charge and mass of positive ions present in positive rays.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion In Millikan\'s experiment for the determination of charge on an electron, oil drops of any size can be used.
Reason Millikan\'s experiment determines the charge on electron, by simply measuring the terminal velocity.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
An oscillator in the walls of cavity in which electromagnetic radiation, has energy equal to 5 h f. Then the oscillator is equivalent to ............
  • 2 : 1
  • 1 : 2
  • 125 : 1
  • 1 : 1
Assertion In the process of photoelectric emission, all the emitted photo electrons have the same kinetic energy.
Reason The photon transfers its whole energy to the electron of the atom in photoelectric effect.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion In photoelectric effect, on increasing the intensity of light, both the number of electrons emitted and kinetic energy of each of them get increased but photoelectric current remains unchanged.
Reason The photoelectric current depends only on wavelength of light.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Standard optical diffraction can not be used for discriminating between different X-ray wavelengths.
Reason The grating spacing is not of the order of X-ray wavelengths.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The threshold frequency of photoelectric effect supports the particle nature of sunlight.
Reason If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion In photo emissive cell inert gas is used.
Reason Inert gas in the photo emissive cell gives greater current.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
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