Whose atomic model describes electrons being embedded in a gel of positive charge?

1. Dalton's model
2. Bohr's model
3. Thomson's model
4. Rutherford's model

Subtopic:  Various Atomic Models |
 61%
From NCERT
NEET - 2016
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The Rutherford α-particle experiment shows that most of the α-particles pass through almost unscattered while some are scattered through large angles. What information does it give about the structure of the atom?

1. Atom is hollow.
2. The whole mass of the atom is concentrated in a small center called the nucleus.
3. Nucleus is positively charged.
4. All of the above
Subtopic:  Various Atomic Models |
 86%
From NCERT
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A hydrogen atom is excited from the ground state to the state of principal quantum number 4. Then the number of spectral lines observed will be:

1. 3                   

2. 6

3. 5                   

4. 2

Subtopic:  Spectral Series |
 87%
From NCERT
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What is the ratio of the speed of an electron in the first orbit of an H-atom to the speed of light?

1.  1137

2.  137

3.  183

4.  147

Subtopic:  Bohr's Model of Atom |
 82%
From NCERT
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Which of the following transitions gives a photon the 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 |
 59%
From NCERT
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What is the ratio of the energies of the hydrogen atom in its first and second excited states?

1. 14

2. 49

3. 94

4. 4

Subtopic:  Bohr's Model of Atom |
 71%
From NCERT
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In the diagram shown below, two atomic transitions are shown. If λ1 = 3000 Ao and λ2 = 6000 Ao, then the value of λ will be:

 
1.  2000 Ao

2.  4000 Ao

3.  4500 Ao

4.  9000 Ao

Subtopic:  Spectral Series |
 74%
From NCERT
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The ionisation potential of H-atom is -13.6 eV. Photons with an energy of 12.85 eV are incident on a sample of H-atoms in their ground state. How many spectral lines are expected in emitted radiation?

1.  2

2.  6

3.  4

4.  1

Subtopic:  Spectral Series |
 70%
From NCERT
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Let f1 be the maximum frequency of the Lyman series, f2 be the frequency of the first line of the Lyman series, and f3 be the frequency of the series limit of the Balmer series, then which of the following is correct?

1.  f1 - f2 = f3

2.  f2 - f1 = f3

3.  f1 + f2 = f3

4.  2f1 = f2 + f3

Subtopic:  Spectral Series |
 64%
From NCERT
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What happens when an electron in a hydrogen-like atom jumps from a lower energy level to a higher energy level?

1. kinetic energy increases.
2. angular momentum decreases.
3. de-Broglie wavelength associated with electron increases.
4. angular momentum remains constant.
Subtopic:  Bohr's Model of Atom |
 52%
From NCERT
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