The energy of an electron in excited hydrogen atom is -3.4 eV. Then according to Bohr's theory, the angular momentum of the electron in Js is

(1) 2.11 ×10-34 Js

(2) 3 ×10-34 Js

(3) 2×10-34 Js

(4) 0.5 ×10-34 Js

Subtopic:  Bohr's Model of Atom |
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When hydrogen atom is in its first excited level, its radius is [1997]

(1) four times, its ground state radius

(2) twice, its ground state radius

(3) same as its ground state radius

(4) half of its ground state radius

Subtopic:  Bohr's Model of Atom |
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The ionisation potential of helium atom is 24.6 volt, the energy required to ionise it will be

(1) 24.6 eV            (2) 24.6 volt          (3) 13.6 volt                 (4) 13..6 eV

Subtopic:  Various Atomic Models |
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The ionisation energy of hydrogen atom is 13.6 eV, the ionisation energy of helium atom would be [1988]

(1) 13.6 eV            (2) 27.2 eV           (3) 6.8 eV            (4) 54.4 eV

Subtopic:  Bohr's Model of Atom |
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If an electron in an hydrogen atom jumps from an orbit ni=3 to an orbit with level nf=2, the frequency of the emitted radiation is 

(1) v=36 C5 R               (2) v = CR6                (3) v = 5 RC36             (4) v  = 6 CR

Subtopic:  Bohr's Model of Atom |
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The longest and shortest wavelength of the Lyman series are (respectively)

1.  1215 A0, 500 A0   

2.  1215 A0, 912 A0  

3.  912 A0, 500 A0   

4.  912 A0, 700 A0

Subtopic:  Spectral Series |
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The shortest wavelength of Balmer series is about 

1.  912Ao

2.  121Ao

3.  3648Ao

4.  4864Ao

 

Subtopic:  Spectral Series |
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Which of the following transition in a hydrogen atom will produce radiations of minimum wavelength?

1.  n = 2 to n = 1

2.  n = 5 to n = 3

3.  n = 10 to n = 5

4.  n = 10 to n = 3

Subtopic:  Spectral Series |
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The frequency Of radiation emitted during the transition of an electron from a second excited state to a first excited state in H-atom is f0. The frequency of the same transition emitted by a singly ionized He ion is

1.  2f0 

2.  4f0  

3.  f02  

4.  f04

Subtopic:  Bohr's Model of Atom |
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When neutron moving with Kinetic Energy 2eV collides with 

stationary H11 in the ground state, the collision will be:

1.  Must be elastic

2.  may be inelastic

3.  Both

4.  Must be perfectly inelastic

 

Subtopic:  Bohr's Model of Atom |
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