In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of:

(a) excitation of electrons in the atoms

(b) the collision between the atoms of the gas

(c) the collisions between the charged particles emitted from the cathode and the atoms of the gas

(d) the collision between different electrons of the atoms of the gas

Concept Questions :-

X-ray
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Difficulty Level:

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

Concept Questions :-

Various atomic model
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Difficulty Level:

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

(c) Along a hyperbolic path

(d) Along a circular path

Concept Questions :-

Various atomic model
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Difficulty Level:

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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Difficulty Level:

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

Concept Questions :-

Various atomic model
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Difficulty Level:

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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Difficulty Level:

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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Difficulty Level:

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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Difficulty Level:

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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Difficulty Level:

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