The ionization energy of the electron in the hydrogen atom in its ground state is 13.6 eV. The atoms are excited to higher energy levels to emit radiations of 6 wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between

(a) n=3 to n=2 states

(b) n=3 to n=1 states

(c) n=2 to n=1 states

(d) n=4 to n=3 states

Concept Questions :-

Spectral series
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Difficulty Level:

The ground state energy of hydrogen atom is -13.6 eV. When its electron is in the first excited state, its excitation energy is:

(a) 3.4 eV                                (b) 6.8 eV

(c) 10.2 eV                              (d) zero

Concept Questions :-

Bohr's model of atom
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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) collision between the atoms of the gas

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

(d) 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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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

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