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Q. No.What is the ratio of the circumference of the first Bohr orbit for the electron in the hydrogen atom to the de-Broglie wavelength of electrons having the same velocity as the electron in the first Bohr orbit of the hydrogen atom?
1. \(1:1\)
2. \(1:2\)
3. \(1:4\)
4. \(2:1\)
Subtopic: Bohr's Model of Atom |
78%
Level 2: 60%+
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The difference between \(n^{th}\) and \((n+1)^{th}\) Bohr's radius of the '\(\mathrm{H}\)' atom is equal to its \((n-1)^{th}\) Bohr's radius. What is the value of \(n\)?
1. \(1\)
2. \(2\)
3. \(3\)
4. \(4\)
1. \(1\)
2. \(2\)
3. \(3\)
4. \(4\)
Subtopic: Bohr's Model of Atom |
54%
Level 3: 35%-60%
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What is the ratio of the energies of the hydrogen atom in its first and second excited states?
| 1. | \(\dfrac{1}{4}\) | 2. | \(\dfrac{4}{9}\) |
| 3. | \(\dfrac{9}{4}\) | 4. | \(4\) |
Subtopic: Bohr's Model of Atom |
74%
Level 2: 60%+
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Which of the following transitions gives a photon the maximum energy?
1. \(n=1 ~\text{to}~n=2\)
2. \(n=2 ~\text{to}~n=1\)
3. \(n=2 ~\text{to}~n=6\)
4. \(n=6 ~\text{to}~n=2\)
1. \(n=1 ~\text{to}~n=2\)
2. \(n=2 ~\text{to}~n=1\)
3. \(n=2 ~\text{to}~n=6\)
4. \(n=6 ~\text{to}~n=2\)
Subtopic: Bohr's Model of Atom |
61%
Level 2: 60%+
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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 |
70%
Level 2: 60%+
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. | The atom is hollow. |
| 2. | The whole mass of the atom is concentrated in a small center called the nucleus. |
| 3. | The nucleus is positively charged. |
| 4. | All of the above |
Subtopic: Various Atomic Models |
86%
Level 1: 80%+
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A hydrogen atom is excited from the ground state to the state of the principal quantum number \(4.\) Then the number of spectral lines observed will be:
1. \(3\)
2. \(6\)
3. \(5\)
4. \(2\)
1. \(3\)
2. \(6\)
3. \(5\)
4. \(2\)
Subtopic: Spectral Series |
87%
Level 1: 80%+
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How much is the total energy of an electron in the first orbit of a hydrogen atom equal to?
| 1. | total energy of electron in \(1\text{st}\) orbit of \(\mathrm{He}^{+}\) |
| 2. | total energy of electron in \(3\text{rd}\) orbit of \(\mathrm{He}^{+}\) |
| 3. | total energy of electron in \(2\text{nd}\) orbit of \(\mathrm{Li}^{++}\) |
| 4. | total energy of electron in \(3\text{rd}\) orbit of \(\mathrm{Li}^{++}\) |
Subtopic: Bohr's Model of Atom |
75%
Level 2: 60%+
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An electron revolves around a nucleus of charge \(Ze\). In order to excite the electron from the state \(n=3\) to \(n=4\), the energy required is \(66.0 ~\text{eV}\).
The value of \(Z\) will be:
1. \(25\)
2. \(10\)
3. \(4\)
4. \(5\)
Subtopic: Bohr's Model of Atom |
67%
Level 2: 60%+
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What is the ratio of the speed of an electron in the first orbit of an \(\mathrm{H}\text-\)atom to the speed of light?
| 1. | \(\dfrac{1}{137}\) | 2. | \(137\) |
| 3. | \(\dfrac{1}{83}\) | 4. | \(\dfrac{1}{47}\) |
Subtopic: Bohr's Model of Atom |
83%
Level 1: 80%+
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