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

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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

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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

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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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If R is the Rydberg’s constant for hydrogen the wave number of the first line in the Lyman series will be

(a) R4                   (b) 3R4
(c) R2                   (d) 2R

Concept Questions :-

Spectral series
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In hydrogen atom, if the difference in the energy of the electron in n =2 and n = 3 orbits is E, the ionization energy of hydrogen atom is 
(a) 13.2 E                (b) 7.2 E
(c) 5.6 E                  (d) 3.2 E

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Bohr's model of atom
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The first member of the Paschen series in hydrogen spectrum is of wavelength 18,800 Å. The short wavelengths limit of Paschen series is 
(a) 1215 Å     (b) 6560 Å
(c) 8225 Å     (d) 12850 Å

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Spectral series
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The ratio of the largest to shortest wavelengths in Lyman series of hydrogen spectra is 
(a) 259         (b) 176
(c) 95           (d) 43

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Spectral series
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