For electron moving in nth orbit of H-atom the angular velocity is proportional to 
(a) n                       (b) 1/n
(c) n3                     (d) 1/n3

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Bohr's model of atom
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The energy of electron in first excited state of H-atom is -3.4 eV its kinetic energy is

(a) – 3.4 eV                 (b) + 3.4 eV
(c) – 6.8 eV                 (d) 6.8 eV

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Bohr's model of atom
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Which of the following phenomena suggests the presence of electron energy levels in atoms 

(a) Radio active decay

(b) Isotopes

(c) Spectral lines

(d) α-particles scattering

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Various atomic model
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Which of the following spectral series in hydrogen atom give spectral line of 4860 Å 
(a) Lyman               (b) Balmer
(c) Paschen             (d) Brackett

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Spectral series
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When an electron in hydrogen atom is excited, from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck’s constant: h = 6.6×10-34 J-s6.6)

(a) 4.16×10-34 J-s               (b) 3.32×10-34 J-s
(c) 1.05×10-34 J-s               (d) 2.08×10-34 J-s

Concept Questions :-

Bohr's model of atom
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The concept of stationary orbits was proposed by

(a) Neil Bohr              (b) J.J. Thomson
(c) Ruther ford           (d) I. Newton

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Various atomic model
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What will be the angular momentum of a electron, if energy of this electron in H-atom is 1.5eV (in J-sec) 
(a) 1.05×10-34           (b) 2.1×10-34
(c) 3.15×10-34           (d)  -2.1×10-34

Concept Questions :-

Bohr's model of atom
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Who discovered spin quantum number 
(a) Unlenbeck and Goudsmit
(b) Nell’s Bohr
(c) Zeeman
(d) Sommerfield

Concept Questions :-

Various atomic model
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The time of revolution of an electron around a nucleus of charge Ze in nth Bohr orbit is directly proportional to

(a) n             (b) n3Z2
(c) n2Z          (d) Zn

Concept Questions :-

Bohr's model of atom
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In Bohr’s model, if the atomic radius of the first orbit is r0, then the radius of the fourth orbit is 
(a) r0              (b) 4r0
(c) r0/16          (d) 16r0

Concept Questions :-

Bohr's model of atom
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