The ratio of momenta of an electron and an $\mathrm{\alpha }$- particle which are accelerated from rest by a potential difference of 100 V is

1. 1                              2. $\sqrt{\frac{2{\mathrm{m}}_{\mathrm{e}}}{{\mathrm{m}}_{\mathrm{\alpha }}}}$
3. $\sqrt{\frac{{\mathrm{m}}_{\mathrm{e}}}{{\mathrm{m}}_{\mathrm{\alpha }}}}$                      4. $\sqrt{\frac{{\mathrm{m}}_{\mathrm{e}}}{2{\mathrm{m}}_{\mathrm{\alpha }}}}$

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Various atomic model
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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

Concept Questions :-

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) $1.76×{10}^{11}$ coulomb/kg

(d) $1.76×{10}^{-11}$  coulomb/kg

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

(a)             (b) 418.6 calories
(c)                  (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 $1.6×{10}^{11}$ coulomb/kg, the velocity acquired by the electron will be

(a)                             (b)
(c)                          (d)

Concept Questions :-

Various atomic model
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The ratio of specific charge of an $\mathrm{\alpha }$-particle to that of a proton is
(a) 2 : 1                      (b) 1 : 1
(c) 1 : 2                      (d) 1 : 3

Concept Questions :-

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

Concept Questions :-

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

(a) Positron                   (b) Proton
(c) ${\mathrm{He}}^{++}$                           (d) None of these

Concept Questions :-

Various atomic model
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For the Bohr's first orbit of circumference $2\mathrm{\pi r}$, the de-Broglie wavelength of revolving electron will be

(a) $2\mathrm{\pi r}$                       (b) $\mathrm{\pi r}$
(c) $\frac{1}{2\mathrm{\pi r}}$                      (d) $\frac{1}{4\mathrm{\pi r}}$

Concept Questions :-

Bohr's model of atom
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