JEE Questions for Physics Dual Nature Of Radiation And Matter Quiz 8 - MCQExams.com

Read the paragraph carefully and select the proper choice from given multiple choices. According to Einstein when a photon of light of frequency f or wavelength λ is incident on a photo sensitive metal surface of work function Ø . Where Ø < hf (here h is Plank\'s constant) then the emission of photo-electrons place takes place. The maximum K.E. of emitted photo electrons is given by Kmax = hf – Ø . If the there hold frequency of metal is f0 then hf0 = Ø .
The threshold frequency fo = ...........× 1014 Hz.
  • 4.0
  • 4.2
  • 8.0
  • 8.4

Physics-Dual Nature of Radiation and Matter-67653.png
  • A → p, B → q, C → r, D → s
  • A → q, B → r, C → s, D → p
  • A → r, B → p, C → q, D → s
  • A → r, B → p, C → s, D → q

Physics-Dual Nature of Radiation and Matter-67654.png
  • A → p, B → q, C → r, D → s
  • A → q, B → r, C →s, D → p
  • A → r, B → s , C → p, D → q
  • A → s, B → r, C → q, D → p

Physics-Dual Nature of Radiation and Matter-67655.png
  • I → P, II → Q, III → R, IV → S
  • I → S, II → P, III → Q, IV → R
  • I → Q, II → R, III → S, IV → P
  • I → R, II → S, III → P, IV → Q

Physics-Dual Nature of Radiation and Matter-67656.png
  • I → P, II → Q, III → R, IV → S
  • I → R, II → S, III → Q, IV → P
  • I → R, II → S, III → P, IV → Q
  • I → S, II → R, III → Q, IV → P

Physics-Dual Nature of Radiation and Matter-67657.png
  • A → p, r B → q ,s C → q,s D → r
  • A → q, r B → r ,s C → q,s D → r
  • A → r B → p ,s C → p,q D → r
  • A → s, r B → q ,r C → q,p D → r
The value of stopping potential in the following diagram
Physics-Dual Nature of Radiation and Matter-67658.png
  • – 4V
  • –3V
  • -2V
  • -1V
In the following diagram if V1 > V2 then........
Physics-Dual Nature of Radiation and Matter-67659.png

  • Physics-Dual Nature of Radiation and Matter-67660.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67661.png

  • Physics-Dual Nature of Radiation and Matter-67662.png

  • Physics-Dual Nature of Radiation and Matter-67663.png
A point source of light is used n 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-67665.png
  • a
  • b
  • c
  • d
In a parabola spectrograph, the velocities of four positive ions P, Q, R and S are u1, u2, u3 and u4 respectively. Then
  • 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 a shown in the figure.
Physics-Dual Nature of Radiation and Matter-67668.png
  • The specific charge of R and S are same
  • The masses of P and S are same
  • The specific chrage of Q and R are same
  • The velocities of R and S are same
Kinetic energy of photo electron EK changes with frequency (f) of light. Which of the following graph represents this emission ?

  • Physics-Dual Nature of Radiation and Matter-67669.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67670.png

  • Physics-Dual Nature of Radiation and Matter-67671.png

  • Physics-Dual Nature of Radiation and Matter-67672.png
Which of the following graph shows change in momentum of particle which de-Broglie wavelength ?

  • Physics-Dual Nature of Radiation and Matter-67673.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67674.png

  • Physics-Dual Nature of Radiation and Matter-67675.png

  • Physics-Dual Nature of Radiation and Matter-67676.png
In a photocell, the curve for current 1 versus potential difference V is best represented by Fig.

  • Physics-Dual Nature of Radiation and Matter-67677.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67678.png

  • Physics-Dual Nature of Radiation and Matter-67679.png

  • Physics-Dual Nature of Radiation and Matter-67680.png
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-67681.png
  • 2)
    Physics-Dual Nature of Radiation and Matter-67682.png

  • Physics-Dual Nature of Radiation and Matter-67683.png

  • Physics-Dual Nature of Radiation and Matter-67684.png
Millikan\'s oil-drop experiment established that
  • Electric charge depends on velocity Specific charge of electron is 1.76 × 1011 C kg–1
  • Electron has wave nature
  • Electric charge is quantized
  • Electron has particle nature
The cathode rays have particle nature because of the fact that
  • They can propagate in vacuum
  • They are deflected by electric and magnetic fields
  • They produced fluorescence
  • They cast shadows
The mass of a particle is 400 times than that an electron and the charge is double. The particle is accelerated by5 V. Initially the particle remained in rest, then its final kinetic energy will be
  • 5 eV
  • 10 eV
  • 100 eV
  • 2000 eV
When cathode-rays strike a metal target of high melting point with a very high velocity, then which of the following are produced?
  • α-rays
  • X-rays
  • Ultraviolet rays
  • γ-waves
While doing his experiment, Millikan one day observed the following charges on a single drop
(i) 6.563 x 10–19 C
(ii) 8.204 x 10–19 C
(iii) 11.50 x 10–19 C
(iv) 13.13 x 10–19C
(v) 16.48 x 10–19 C
(vi) 18.09 x 10–19 C
From this data the value of the elementary charge (e) was found to be
  • 1.641 x 10–19 C
  • 1.630 x 10–19 C
  • 1.648 x 10–19 C
  • 1.602 x 10–19 C

Physics-Dual Nature of Radiation and Matter-67688.png
  • 1
  • 0
  • gE /gm
  • gm / gE
Vidicon works on the principle of
  • Electrical conductivity
  • Photoconductivity
  • Thermal conductivity
  • SONAR
When the speed of electrons increase, then the value of its specific charge
  • Increases
  • Decreases
  • Remains unchanged
  • Increases upto some velocity and then begins to decrease
In an electron gun the control grid is given a negative potential relative to cathode in order to
  • Decelerate electrons
  • Repel electrons and thus to control the number of electrons passing through it
  • To select electrons of same velocity and to converge them along the axis
  • To decrease the kinetic energy of electrons
The ratio of momenta of an electron and an a-particle which are accelerated from rest by a potential difference of 100 V is
  • 1
  • 2)
    Physics-Dual Nature of Radiation and Matter-67690.png

  • Physics-Dual Nature of Radiation and Matter-67691.png

  • Physics-Dual Nature of Radiation and Matter-67692.png
When subjected to a transverse electric field, cathode rays move
  • Down the potential gradient
  • Up the potential gradient
  • Along a hyperbolic path
  • Along a circular path
The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by
  • Planck
  • J.J. Thomson
  • Einstein
  • Millikan
The charge on electron was discovered by
  • J.J. Thomson
  • Neil Bohr
  • Millikan
  • Chadwick
From the following, what charges can be present on oil drops in Millikan\'s experiment
  • Zero, equal to the magnitude of charge on α-particle
  • 1.6 ×10–18 C
  • 1.6 × 10–19 C, 2.5 e
  • 1.5 e, e (Here e is the electronic charge)
In Thomson's method of determining elm of electrons
  • Magnetic field is parallel to the electrons beam
  • Electric and magnetic fields are parallel to electrons beam
  • Electric and magnetic fields are parallel to each other and perpendicular to electrons beam
  • Electric field is parallel to the electrons beam
Cathode rays enter into a uniform magnetic field perpendicular to the direction of the field. In the magnetic field their path will be
  • Straight line
  • Circle
  • Parabolic
  • Ellipse
The specific charge of an electron is
  • 1.6 × 10–19 coulomb
  • 4.8 × 10–10 stat coulomb
  • 1.76 × 1011 coulomb/kg
  • 1.76 × 10–11 coulomb/kg
An electron is moving with constant velocity along x-axis. If a uniform electric field is applied along y-axis, then its path in the x-y plane will be
  • A straight line
  • A circle
  • A parabola
  • An ellipse
Cathode rays are similar to visible light rays as
  • They both can be deflected by electric and magnetic fields
  • They both have a definite magnitude of wavelength
  • They both can ionise a gas through which they pass
  • They both can expose a photographic plate
A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength 20 Vm–1 and 0.5 T at right angles to the direction of motion of the electrons. What is the velocity of the electrons?
  • 20 ms–1
  • 40 ms–1
  • 8 ms–1
  • 5.5 ms–1
Kinetic energy of emitted cathode rays is dependent on
  • Only voltage
  • Only work function
  • Both (a) and (b)
  • It does not depend upon any physical quantity
The radius of the orbital of electron in the hydrogen atom is 0.5 Å. The speed of the electron is 2 × 106 m/s. Then the current in the loop due to the motion of the electron is
  • 1 mA
  • 1.5 mA
  • 2.5 mA
  • 1.5 x 10–2 mA
The kinetic energy of an electron which is accelerated through a potential of 100 volts is
  • 1.602 × 10–17 J
  • 418.6 calories
  • 1.16 × 104 K
  • 6.626 × 10–34 W-sec
When a proton is accelerated with 1 volt potential difference, then its kinetic energy is

  • Physics-Dual Nature of Radiation and Matter-67699.png
  • 1840 eV
  • 1 eV
  • 1840 c2 eV
Energy of electrons can be increased by allowing them
  • To fall through electric potential
  • To move in high magnetic field
  • To fall from great heights
  • To pass through lead blocks
Cathode rays and canal rays produced in a certain discharge tube are deflected in the same direction if
  • A magnetic field is applied normally
  • An electric field is applied normally
  • An electric field is applied tangentially
  • A magnetic field is applied tangentially
Velocity ratio of the two cathode rays is 1 : 2. They are applied to the same electric field. What is the deflection ratio of the two cathode rays
  • 1 : 2
  • 1 : 4
  • 4 : 1
  • 8 : 1

Physics-Dual Nature of Radiation and Matter-67704.png
  • 1.6 ×10–19 C
  • 3.2 × 10–19 C
  • 4.8 × 10–19 C
  • 8.0 × 10–19 C
Cathode rays are
  • Positive rays
  • Neutral rays
  • He rays
  • Electron waves
An electron of charge \'e\' coulomb passes through a potential difference of V volts. Its energy in \'joules\' will be
  • V /e
  • eV
  • e /V
  • V
In Millikan\'s oil drop experiment, an oil drop of mass 16 × 10–6 kg is balanced by an electric field of 106 V/m. The charge in coulomb on the drop, assuming g = 10 m/s2 is
  • 6.2 × 10–11
  • 16 × 10–9
  • 16 × 10–11
  • 16 ×10–13
Which is not true will respect to the cathode rays?
  • Charged particles
  • A stream of electrons
  • Move with speed same as that of light
  • Can be deflected by magnetic fields
In Thomsons experiment of finding e/m for electrons, beam of electron is replaced by that of muons (particles with same charge as of electrons but mass 208 times that of electrons). No deflection condition in this case is satisfied if
  • B is increased 208 times
  • E is increased 208 times
  • B is increased 14.4 times
  • None of the above
The colour of the positive column in a gas discharge tube depends on
  • The type of glass used to construct the tube
  • The gas in the tube
  • The applied voltage
  • The material of the cathode
Cathode rays are produced when the pressure is of the order of
  • 2 cm of Hg
  • 0.1 cm of Hg
  • 0.01 mm of Hg
  • 1 µm of Hg
0:0:1


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