The ionisation potential of hydrogen atom is

1. 13.60 volt

2. 8.24 volt

3. 10.36 volt 

4. 14.24 bolt

Subtopic:  Bohr's Model of Atom |
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Ionisation potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be:

1. two 

2. three

3. four 

4. one

Subtopic:  Spectral Series |
 61%
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Consider the spectral line resulting from transition \(n=2\) to \(n = 1\) in the atoms and ions given below.  The shortest wavelength is given by:

1. hydrogen atom
2. deuterium
3. singly ionised helium
4. doubly ionised lithium
Subtopic:  Spectral Series |
 56%
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An α-particle of energy 5 MeV is scattered through 180° by a fixed uranium nucleus. The distance of closest approach is of the order

1. 10-10 m 

2. 10-13 m 

3. 10-14 m 

4. 10-16 m

Subtopic:  Various Atomic Models |
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The energy of an electron in an excited hydrogen atom is \(-3.4~\text{eV}\).  Its angular momentum will be:
(\(h = 6.626\times 10^{-34}\) J-s)
1. \(1.11\times 10^{34}~\text{J-s}\)
2. \(1.51\times 10^{-31}~\text{J-s}\)
3. \(2.11\times 10^{-34}~\text{J-s}\)
4. \(3.72\times 10^{-34}~\text{J-s}\)

Subtopic:  Bohr's Model of Atom |
 71%
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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 (OLD NCERT) |
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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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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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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 |
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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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