Consider an electron in the nth orbit of a hydrogen atom in the Bohr model. The circumference of the orbit can be expressed in terms of the de-Broglie wavelength λ of that electron as:

(1) (0.529) nλ           (2) nλ             (3) (13.6) λ         (4) nλ

Subtopic:  Bohr's Model of Atom |
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In the Bohr's model of a hydrogen atom, the centripetal force is furnished by the Coulomb attraction between the proton and the electron.  If α0 is the radius of the ground state orbit, m is the mass and e is the charge on the electron, ε0 is the vaccum permittivity, the speed of the electron is  [1998]

(1) zero          (2) eε0a0m           (3) e4πε0a0m               (4) 4πε0a0me

Subtopic:  Bohr's Model of Atom |
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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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