In the Bohr's hydrogen atom model, the radius of the stationary orbit is directly proportional to (n = principle quantum number) 
(a) n-1              (b) n
(c) n-2              (d) n2

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Bohr's model of atom
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In the nth orbit, the energy of an electron En=-13.6n2eV for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be
(a) 10.2 eV              (b) 12.1 eV 
(c) 13.6 eV              (d) 3.4 eV 

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Bohr's model of atom
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In the following atoms and moleculates for the transition from n= 2 to n = 1, the spectral line of minimum wavelength will be produced by 
(a) Hydrogen atom               (b) Deuterium atom
(c) Uni-ionized helium           (d) di-ionized lithium

Concept Questions :-

Spectral series
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The Lyman series of hydrogen spectrum lies in the region

(a) Infrared                (b) Visible
(c) Ultraviolet             (d) X- rays

Concept Questions :-

Spectral series
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The size of an atom is of the order of

(a) 10-8 m         (b) 10-10 m 
(c) 10-12 m        (d) 10-14 m

Concept Questions :-

Various atomic model
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Which one of the series of hydrogen spectrum is in the visible region 

(a) Lyman series              (b) Balmer series
(c) Paschen series            (d) Bracket series

Concept Questions :-

Spectral series
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The Rutherford α-particle experiment shows that most of the α-particles pass through almost unscattered while some are scattered through large angles. What information does it give about the structure of the atom 

(a) Atom is hollow

(b) The whole mass of the atom is concentrated in a small centre called nucleus

(c) Nucleus is positively charged

(d) All the above

Concept Questions :-

Various atomic model
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Which of the following is true 

(a) Lyman series is a continuous spectrum

(b) Paschen series is a line spectrum in the infrared

(c) Balmer series is a line spectrum in the ultraviolet

(d) The spectral series formula can be derived from the Rutherford model of the hydrogen atom

Concept Questions :-

Spectral series
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The energy required to knock out the electron in the third orbit of a hydrogen atom is equal to
(a) 13.6 eV           (b) +13.69eV
(c) -13.63eV       (d) -313.6eV

Concept Questions :-

Bohr's model of atom
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An electron has a mass of 9.1×10-31 kg. It revolves round the nucleus in a circular orbit of radius 0.529×10-10 metre at a speed of 2.2×106 m/s. The magnitude of its linear momentum in this motion is

(a) 1.1×10-34 kg-m/s             (b) 2.0×10-24 kg-m/s 
(c) 4.0×10-24 kg-m/s           (d) 4.0×10-31 kg-m/s

Concept Questions :-

Various atomic model
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