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)

(1) 4.16×10-34 J-s              

(2) 3.32×10-34 J-s

(3) 1.05×10-34 J-s               

(4) 2.08×10-34 J-s

Subtopic:  Bohr's Model of Atom |
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The concept of stationary orbits was proposed by

(1) Neil Bohr             

(2) J.J. Thomson

(3) Ruther ford           

(4) I. Newton

Subtopic:  Various Atomic Models |
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Who discovered spin quantum number 

(1) Unlenbeck and Goudsmit

(2) Nell’s Bohr

(3) Zeeman

(4) Sommerfield

Subtopic:  Various Atomic Models |
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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

(1) n             

(2) n3Z2

(3) n2Z         

(4) Zn

Subtopic:  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 
(1) r0             

(2) 4r0

(3)r0/16         

(4) 16r0

Subtopic:  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

(1) R4                   

(2) 3R4
(3) R2                 

(4) 2R

Subtopic:  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 

(1) 13.2 E               

(2) 7.2 E

(3) 5.6 E                 

(4) 3.2 E

Subtopic:  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 

(1) 1215 Å     

(2) 6560 Å

(3) 8225 Å     

(4) 12850 Å

Subtopic:  Spectral Series |
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What is the ratio of the largest to shortest wavelengths in the Lyman series of hydrogen spectra?

1. 259        

2. 176
3. 95           

4. 43

Subtopic:  Spectral Series |
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In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n =2 and n = 1 orbits is

(1) 2 : 1             

(2) 4 : 1

(3) 8 : 1             

(4) 16 : 1

Subtopic:  Bohr's Model of Atom |
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