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Q. No.What is the ratio of the energies of the hydrogen atom in its first and second excited states?
1. \(\frac{1}{4}\)
2. \(\frac{4}{9}\)
3. \(\frac{9}{4}\)
4. \(4\)
Subtopic: Bohr's Model of Atom |
70%
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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 |
59%
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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 |
62%
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The Rutherford -particle experiment shows that most of the -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%
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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. \(2\)
1. \(3\)
2. \(6\)
3. \(5\)
4. \(2\)
Subtopic: Spectral Series |
87%
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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. \(\frac{1}{137}\)
2. \(137\)
3. \(\frac{1}{83}\)
4. \(\frac{1}{47}\)
Subtopic: Bohr's Model of Atom |
81%
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In the diagram shown below, two atomic transitions are shown. If \(\lambda_1= 3000~\mathring{A}\) and \(\lambda_2= 6000~\mathring{A},\)
1. \(2000~\mathring{A}\)
2. \(4000~\mathring{A}\)
3. \(4500~\mathring{A}\)
4. \(9000~\mathring{A}\)
Subtopic: Spectral Series |
73%
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The ionisation potential of \(\mathrm{H\text-}\)atom is \(-13.6~\text{eV}\). Photons with an energy of \(12.85\) eV are incident on a sample of \(\mathrm{H}\text-\)atoms in their ground state. How many spectral lines are expected in emitted radiation?
1. \(2\)
2. \(6\)
3. \(4\)
4. \(1\)
1. \(2\)
2. \(6\)
3. \(4\)
4. \(1\)
Subtopic: Spectral Series |
70%
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Let \(f_1\) be the maximum frequency of the Lyman series, \(f_2\) be the frequency of the first line of the Lyman series, and \(f_3\) be the frequency of the series limit of the Balmer series, then which of the following is correct?
1. \(f_1-f_2=f_3\)
2. \(f_2-f_1=f_3\)
3. \(f_1+f_2=f_3\)
4. \(2f_1 = f_2 + f_3\)
1. \(f_1-f_2=f_3\)
2. \(f_2-f_1=f_3\)
3. \(f_1+f_2=f_3\)
4. \(2f_1 = f_2 + f_3\)
Subtopic: Spectral Series |
63%
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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%
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