The energy of 24.6 eV is required to remove one of the electrons from a neutral helium atom. What is the energy (in eV) required to remove both the electrons from a neutral helium atom?

1.  38.2

2.  49.2

3.  51.8

4.  79.0

Subtopic:  Bohr's Model of Atom |
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Which of the following transitions gives photon of maximum energy?

1. n = 1 to n = 2 

2. n = 2 to n = 1

3. n = 2 to n = 6 

4. n = 6 to n = 2

Subtopic:  Bohr's Model of Atom |
 62%
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Hydrogen atoms are excited from ground state of the principal quantum number 4. Then, the number of spectral lines observed will be

1. 3   

2. 6

3. 5

4. 2

Subtopic:  Spectral Series |
 82%
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When electron jumps from n = 4 to n = 2 orbit, we get [2000]

1. second line of Lyman series

2. second line of Balmer series

3. second line of Paschen series

4. an absorption line of Balmer series

Subtopic:  Spectral Series |
 83%
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The spectrum obtained from a sodium vapour lamp is an example of

1. band spectrum

2.  continuous spectrum

3. emission spectrum

4. absorption spectrum

Subtopic:  Spectral Series |
 62%
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The radius of a hydrogen atom in its ground state is 5.3×10-11 m. After collision with an electron, it is found to have a radius of 21.2 ×10-11 m. What is the principal quantum number n of the final state of the atom?

1. n = 4 

2. n = 2 

3. n = 16 

4. n = 3

Subtopic:  Bohr's Model of Atom |
 76%
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In terms of Bohr radius a0, the radius of the second Bohr orbit of a hydrogen atom is given by [1992]

1. 4a0 

2. 8a0 

3. 2a0     

4. 2a0

Subtopic:  Bohr's Model of Atom |
 83%
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 An x-ray tube is operating at 30 kV then the minimum wavelength of the x-rays coming out of the tube is:

1. 1.24 A0

2. 0.413 A0 

3. 0.124 A0 

4. 0.13 A0

Subtopic:  X-Ray (OLD NCERT) |
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A diatomic molecule is made of two masses m1 and m2 which are separated by a distance r.  If we calculate its rotational energy by applying Bohr's rule of angular momentum quantization, its energy will be given by (n is an integer):

1. m1+m22n2h22m12m22r2     

2. n2h22π2(m1+m2)r2

3. 2n2h2(m1+m2)r2   

4. m1+m2n2h28π2m1m2r2

Subtopic:  Bohr's Model of Atom |
 52%
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In a hydrogen atom, which of the following electronic transitions would involve the maximum energy change?

1. from n = 2 to n = 1
2. from n = 3 to n = 1
3. from n = 4 to n = 2
4. from  n = 3 to n = 2
Subtopic:  Bohr's Model of Atom |
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