JEE Questions for Physics Dual Nature Of Radiation And Matter Quiz 13 - MCQExams.com

The ratio of de-Broglie wavelengths of molecules of hydrogen and helium which are at temperature 27°C and 127°C respectively is

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  • 2)
    Physics-Dual Nature of Radiation and Matter-67948.png

  • Physics-Dual Nature of Radiation and Matter-67949.png
  • 1
A silver ball of radius 4.8 cm is suspended by a thread in the vacuum chamber. UV light of wavelength 200 nm is incident on the ball for some time during which a total energy of 1 × 10–7 J falls on the surface. Assuming on an average one out of 103 photons incident is able to eject electron, the potential on sphere will be
  • 1 V
  • 2 V
  • 3 V
  • Zero
A photon of wavelength 6630 Å is incident on a totally reflecting surface. The momentum delivered by the photon is equal to
  • 6.63 × 10–27 kg-m/s
  • 2 ×10–27 kg-m/s
  • 10–27 kg-m/s
  • None of these
The ratio of de-Broglie wavelength of a α-particle to that of a proton being subjected to the same magnetic field so that the radii of their path are equal to each other assuming the field induction vector ( B ) ⃗ is perpendicular to the velocity vectors of the α-particle and the proton is
  • 1
  • 1/4
  • 1/2
  • 2
Kα wavelength emitted by an atom of atomic number Z = 11 is λ. Find the atomic number of an atom that emits Kα radiation with wavelength 4λ
  • Z = 6
  • Z = 4
  • Z = 11
  • Z = 44

Physics-Dual Nature of Radiation and Matter-67955.png
  • 2
  • 1

  • Physics-Dual Nature of Radiation and Matter-67956.png

  • Physics-Dual Nature of Radiation and Matter-67957.png
Rest mass energy of an electron is 0.51 MeV. If this electron is moving with a velocity 0.8 c (where c is velocity of light in vacuum), then kinetic energy of the electron should be
  • 0.28 MeV
  • 0.34 MeV
  • 0.39 MeV
  • 0.46 MeV
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-68009.png
  • a
  • b
  • c
  • d
A proton, a deutron and an α-particle having the same momentum, enters a region of uniform electric field between the parallel plates of a capacitor. The electric field is perpendicular to the initial path of the particles. Then the ratio of deflections suffered by them is
Physics-Dual Nature of Radiation and Matter-67960.png
  • 1 : 2 : 8
  • 1 : 2 : 4
  • 1: 1 : 2
  • None of these
In order to coincide the parabolas formed by singly ionised 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, λβ and 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 > λ β
  • λ’α > λ’ β > λα

  • Physics-Dual Nature of Radiation and Matter-67963.png

  • Physics-Dual Nature of Radiation and Matter-67964.png
The minimum intensity of light to be detected by human eye is 10–10 W/m2. The number of photons of wavelength 5.6 × 10–7 m entering the eye, with pupil area 10–6 m2, per second for vision will be nearly
  • 100
  • 200
  • 300
  • 400
In X-ray tube when the accelerating voltage V is halved, the difference between the wavelength of Kα line and minimum wavelength of continuous X-ray spectrum
  • Remains constant
  • Becomes more than two times
  • Becomes half
  • Becomes less than two times
In a photocell bichromatic light of wavelength 2475 Å and 6000 Å are incident on cathode whose work function is 4.8 eV. If a uniform magnetic field of 3 × 10–5 tesla exists parallel to the plate, the radius of the path described by the photoelectron will be (mass of electron = 9 × 10–31 kg)
  • 1 cm
  • 5 cm
  • 10 cm
  • 25 cm
Two metallic plates A and B, each of area 5 × 10–4m2 are placed parallel to each other at a separation of 1 cm. Plate B carries a positive charge of 33.7 pc. A monochromatic beam of light, with photons of energy 5 eV each, starts falling on plate A at t = 0, so that 1016 photons fall on it per square meter per second. Assume that one photoelectron is emitted for every 106 incident photons. Also assume that all the emitted photoelectrons are collected by plate B and the work function of plate A remains constant at the value 2 eV. Electric field between the plates at the end of 10 seconds is
  • 2 × 103 N/C
  • 103 N/C
  • 5 × 103 N/C
  • Zero
In the following arrangement y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photo current will be
Physics-Dual Nature of Radiation and Matter-67970.png
  • 0.9 V
  • 0.5 V
  • 0.4 V
  • 0.1 V
The eye can detect 5 × 104 photons per square metre per sec of green light (λ = 5000 Å) while the ear can detect 10–13 (W/m2). The factor by which the eye is more sensitive as a power detector than the ear is close to
  • 5
  • 10
  • 106
  • 15
A photon collides with a stationary hydrogen atom in ground state inelastically. Energy of the colliding photon is 10.2 eV. After a time interval of the order of micro second another photon collides with same hydrogen atom inelastically with an energy of 15 eV. What will be observed by the detector?
  • 2 photons of energy 10.2 eV
  • 2 photons of energy of 1.4 eV
  • One photon of energy 10.2 eV and an electron of energy 1.4 eV
  • One photon of energy 10.2 eV and another photon of 1.4 eV
The curve drawn between velocity and frequency of photon in vacuum will be a
  • Straight line parallel to frequency axis
  • Straight line parallel to velocity axis
  • Straight line passing through origin and making an angle of 45° with frequency axis
  • Hyperbola
Photoelectric effect experiments are performed using three different metal plates p, q and r having work functions ϕp = 2.0 eV, ϕq = 2.5 eV and ϕr = 3.0 eV, respectively. A light beam containing wavelengths of 550 nm, 450 nm and 350 nm with equal intensities illuminates each of the plates. The correct I-V graph for the experiment is
(Take he = 1240 eV nm]

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  • 2)
    Physics-Dual Nature of Radiation and Matter-67976.png

  • Physics-Dual Nature of Radiation and Matter-67977.png

  • Physics-Dual Nature of Radiation and Matter-67978.png
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-67980.png
  • Greater than that of B
  • Smaller than that of
  • Equal to that of B
  • No inference can be drawn about their work functions from the given graphs
The intensity of X-rays from a Coolidge tube is plotted against wavelength as shown in the figure. The minimum wavelength found is λc and the wavelength of the Kα line is λk. As the accelerating voltage is increased
Physics-Dual Nature of Radiation and Matter-67981.png
  • (λk – λc) increases
  • (λk – λc) decreases
  • λk increases
  • λk decreases
The figure represents the observed intensity of X-rays emitted by an X-ray tube as a function of wavelength. The sharp peaks A and B denote
Physics-Dual Nature of Radiation and Matter-67983.png
  • Band spectrum
  • Continuous spectrum
  • Characteristic radiations
  • White radiations
The graph between intensity of light falling on a metallic plate (I) with the current (i) generated is

  • Physics-Dual Nature of Radiation and Matter-67984.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67985.png

  • Physics-Dual Nature of Radiation and Matter-67986.png

  • Physics-Dual Nature of Radiation and Matter-67987.png
For a photoelectric cell the graph showing the variation of cut off voltage (V0) with frequency (v) of incident light is best represented by

  • Physics-Dual Nature of Radiation and Matter-67989.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67990.png

  • Physics-Dual Nature of Radiation and Matter-67991.png

  • Physics-Dual Nature of Radiation and Matter-67992.png
The curve between current (i) and potential difference (V) for a photo cell will be

  • Physics-Dual Nature of Radiation and Matter-67994.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67995.png

  • Physics-Dual Nature of Radiation and Matter-67996.png

  • Physics-Dual Nature of Radiation and Matter-67997.png
The correct curve between the stopping potential (V) and intensity of incident light (I) is

  • Physics-Dual Nature of Radiation and Matter-67998.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67999.png

  • Physics-Dual Nature of Radiation and Matter-68000.png

  • Physics-Dual Nature of Radiation and Matter-68001.png
The value of stopping potential in the following diagram
Physics-Dual Nature of Radiation and Matter-68002.png
  • –4V
  • –3V
  • –2V
  • –1V
In the following diagram if V2 > V1 then
Physics-Dual Nature of Radiation and Matter-68003.png

  • Physics-Dual Nature of Radiation and Matter-68004.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68005.png

  • Physics-Dual Nature of Radiation and Matter-68006.png

  • Physics-Dual Nature of Radiation and Matter-68007.png
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-68012.png
  • 5 × 1014 m
  • 6000 Å
  • 5000 Å
  • Cannot be estimated from given data
Figure represents a graph of kinetic energy (K) of photoelectrons (in eV and frequency (v) for a metal used as cathode in photoelectric experiment. The work function of metal is
Physics-Dual Nature of Radiation and Matter-68014.png
  • 1 eV
  • 1.5 eV
  • 2 eV
  • 3 eV
Figure represents the graph of photo current I versus applied voltage (V). The maximum energy of the emitted photoelectrons is
Physics-Dual Nature of Radiation and Matter-68015.png
  • 2 eV
  • 4 eV
  • 0 eV
  • 4 J
The graph that correctly represents the relation of frequency v of a particular characteristic X-ray with the atomic number Z of the material is

  • Physics-Dual Nature of Radiation and Matter-68017.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68018.png

  • Physics-Dual Nature of Radiation and Matter-68019.png

  • Physics-Dual Nature of Radiation and Matter-68020.png
The intensity distribution of X-rays from two coolidge tubes operated on different voltages V1 and V2 and using different target materials of atomic numbers Z1 and Z2 is shown in the figure. Which one of the following inequalities is true
Physics-Dual Nature of Radiation and Matter-68022.png
  • V1 > V2 , Z1 < Z2
  • V1 > V2 , Z1 > Z2
  • V1 < V2 , Z1 > Z2
  • V1 = V2 , Z2 < Z2
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-68024.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-68026.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68027.png

  • Physics-Dual Nature of Radiation and Matter-68028.png

  • Physics-Dual Nature of Radiation and Matter-68029.png
The dependence of the short wavelength limit λmin on the accelerating potential V is represented by the curve of figure
Physics-Dual Nature of Radiation and Matter-68031.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-68033.png
  • A
  • B
  • C
  • None of these
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-68035.png
  • 6.6 × 10–31 J-s
  • 6.6 × 10–34 J-s
  • 9.1 × 10–31 J-s
  • None of the above
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-68037.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68038.png

  • Physics-Dual Nature of Radiation and Matter-68039.png

  • Physics-Dual Nature of Radiation and Matter-68040.png
The figure showing the correct relationship between the stopping potential V0 and the frequency v of light for potassium and tungsten is

  • Physics-Dual Nature of Radiation and Matter-68042.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68043.png

  • Physics-Dual Nature of Radiation and Matter-68044.png

  • Physics-Dual Nature of Radiation and Matter-68045.png
The log-log graph between the energy E of an electron and its de-Broglie wavelength X will be

  • Physics-Dual Nature of Radiation and Matter-68047.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68048.png

  • Physics-Dual Nature of Radiation and Matter-68049.png

  • Physics-Dual Nature of Radiation and Matter-68050.png
The graph between the square root of the frequency of a specific line of characteristic spectrum of X-rays and the atomic number of the target will be

  • Physics-Dual Nature of Radiation and Matter-68052.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68053.png

  • Physics-Dual Nature of Radiation and Matter-68054.png

  • Physics-Dual Nature of Radiation and Matter-68055.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-68057.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-68059.png
  • –4 V
  • –1 V
  • –3 V
  • –2 V
In a parabola spectrograph, the velocities positive ions P, Q, R and S are v1, v2, v3 and v4respectively. Then
Physics-Dual Nature of Radiation and Matter-68061.png
  • v1 > v2 > v3 > v4
  • v1 < v2 < v3 < v4
  • v1 = v2 = v3 = v4
  • v1 << v2 > v3 < v4
In Thomson spectrograph experiment, four positive ions P, Q, R and S are situated on YX curve as shown in the figure
Physics-Dual Nature of Radiation and Matter-68063.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
From the figure describing photoelectric effect we may infer correctly that
Physics-Dual Nature of Radiation and Matter-68064.png
  • Na and Al both have the same threshold frequency
  • Maximum kinetic energy for both the metals depend linearly on the frequency
  • The stopping potentials are different for Na and Al for the same change in frequency
  • Al is a better photo sensitive material than Na
The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows

  • Physics-Dual Nature of Radiation and Matter-68065.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-68066.png

  • Physics-Dual Nature of Radiation and Matter-68067.png

  • Physics-Dual Nature of Radiation and Matter-68068.png
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-68069.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
0:0:1


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