The energy of an electron in an excited hydrogen atom is -3.4 eV.  Its angular momentum will be:
(h = 6.626 × 10-34 J-s)

1. 1.11 × 1034 J s 

2. 1.51 ×10-31 J s

3. 2.11 × 10-34 J s

4. 3.72 × 10-34 J s

Subtopic:  Bohr's Model of Atom |
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As per the Bohr model, the minimum energy (in eV) required to remove the electron from the ground state of a double ionised lithium ion (Z = 3) is:

1. 1.51

2. 13.6 

3. 40.8

4. 122.4

Subtopic:  Bohr's Model of Atom |
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The wavelength of Ka X-rays produced by an X-ray tube is 0.76 A. Find the atomic number of the anode material of the tube?

1. 41

2. 30

3. 20

4. 10

Subtopic:  X-Ray |
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According to Bohr's theory, the moment of momentum of an electron revolving in second orbit of hydrogen atom will be:
1. \(2\pi h\)
2. \(\pi h\) 
3. \(\frac{h}{\pi}\)
4. \(\frac{2h}{\pi}\)

Subtopic:  Bohr's Model of Atom |
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The ionisation energy of a hydrogen atom is 13.6 eV. Following Bohr's theory, what is the energy corresponding to a transition between the 3rd and 4th orbit?

1. 3.40 eV

2. 1.51 eV

3. 0.85  eV 

4. 0.66 eV

Subtopic:  Bohr's Model of Atom |
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The ratio of the energies of the hydrogen atom in its first to second excited states is

1. 14 

2. 49

3. 94

4. 4

Subtopic:  Bohr's Model of Atom |
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Energy levels A, B, C of a certain atom correspond to increasing values of energy i.e. EA<EB<EC. If λ1, λ2, λ3 are the wavelengths of the radiation corresponding to the transitions C to B, B to A and C to A respectively, which of the following relation is correct?

1. λ3=λ1+λ2 

2. λ3=λ1λ2λ1+λ2

3. λ1+λ2+λ3=0 

4. λ32=λ12+λ22

Subtopic:  Spectral Series |
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In the Rutherford scattering experiment, what will be the correct angle for -scattering for an impact parameter, b = 0?

1. 90

2. 270

3. 0 

4. 180

Subtopic:  Various Atomic Models |
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The velocity of the electron in the ground state (H - atom) is 

1. 2.18×105 m/s   

2. 2.18×106 m/s

3. 2.18×107 m/s   

4. 2.18×108 m/s

Subtopic:  Various Atomic Models |
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The element which has Kα X-ray line whose wavelength is 0.18 nm is:

1. Cobalt 

2.  Xenon

3. Copper 

4. Iron

Subtopic:  Spectral Series |
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