When subjected to a transverse electric field, cathode rays move: 

(a) Down the potential gradient

(b) Up the potential gradient

(c) Along a hyperbolic path

(d) Along a circular path

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Various atomic model
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The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by 
(a) Planck                   (b) J.J. Thomson
(c) Einstein                 (d) Millikan

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Various atomic model
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The specific charge of an electron is 

(a) 1.6×10-19 coulomb

(b) 4.8×10-10 stat coulomb

(c) 1.76×1011 coulomb/kg

(d) 1.76×10-11  coulomb/kg

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The kinetic energy of an electron which is accelerated through a potential of 100 volts is

(a) 1.602×10-17 J            (b) 418.6 calories
(c) 1.16×104 K                 (d) 6.626×10-14 W- sec

Concept Questions :-

Various atomic model
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An electron is accelerated through a potential difference of 200 volts. If e/m for the electron be 1.6×1011 coulomb/kg, the velocity acquired by the electron will be

(a) 8×106 m/s                            (b) 8×105 m/s
(c) 5.9×106 m/s                         (d) 5.9×105 m/s

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Various atomic model
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The ratio of specific charge of an α-particle to that of a proton is 
(a) 2 : 1                      (b) 1 : 1
(c) 1 : 2                      (d) 1 : 3

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Various atomic model
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A charge of magnitude 3e and mass 2m is moving in an electric field E. The acceleration imparted to the charge is

(a) 2Ee / 3m                  (b) 3Ee / 2m 
(c) 2m / 3Ee                  (d) 3m / 2Ee

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Various atomic model
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Which of the following have the highest specific charge

(a) Positron                   (b) Proton
(c) He++                           (d) None of these

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Various atomic model
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For the Bohr's first orbit of circumference 2πr, the de-Broglie wavelength of revolving electron will be

(a) 2πr                       (b) πr
(c) 12πr                      (d) 14πr

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Bohr's model of atom
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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 1Å would be 
(a) 2.5/5000 eV             (b) 2.5/50002 eV
(c) 2.5×5000 eV           (d)  2.5×50002 eV

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