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Q. No.Which statement about the Rutherford model of the atom is not true?
| 1. | There is a positively charged centre in an atom called the nucleus. |
| 2. | Nearly all the mass of an atom resides in the nucleus. |
| 3. | The size of the nucleus is the same as that of the atom. |
| 4. | Electrons occupy the space surrounding the nucleus. |
Subtopic: Various Atomic Models |
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Level 1: 80%+
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In a Rutherford scattering experiment, when a projectile of charge \(Z_1\) and mass \(M_1\) approaches a target nucleus of charge \(Z_2\) and mass \(M_2\), the distance of the closest approach is \(r_0\). The energy of the projectile is:
| 1. | directly proportional to \(M_1M_2\). |
| 2. | directly proportional to \(Z_1Z_2\). |
| 3. | inversely proportional to \(Z_1\). |
| 4. | directly proportional to mass \(M_1\). |
Subtopic: Various Atomic Models |
83%
Level 1: 80%+
AIPMT - 2009
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Given below are two statements:
| Statement I: | The scattering of α-particles at large angles is primarily due to the atomic nucleus. |
| Statement II: | The atomic nucleus is very heavy in comparison to electrons. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is correct. |
| 3. | Both Statement I and Statement II are correct. |
| 4. | Both Statement I and Statement II are incorrect. |
Subtopic: Various Atomic Models |
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As compared to \(^{12}\mathrm{C}\) atoms, \(^{14}\mathrm{C}\) atom has:
| 1. | two extra protons and two extra electrons. |
| 2. | two extra protons but no extra electrons. |
| 3. | two extra neutrons but no extra electrons. |
| 4. | two extra neutrons and two extra electrons. |
Subtopic: Various Atomic Models |
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Level 2: 60%+
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An alpha nucleus of energy \({1 \over 2 } mv^2\) bombards a heavy nuclear target of charge \(Ze\). Then the distance of the closest approach for the alpha nucleus will be proportional to:
1. \(v^2\)
2. \(1/ v^4\)
3. \(1 /m\)
4. \(1/Ze\)
1. \(v^2\)
2. \(1/ v^4\)
3. \(1 /m\)
4. \(1/Ze\)
Subtopic: Various Atomic Models |
78%
Level 2: 60%+
NEET - 2010
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What is the minimum orbital angular momentum of an electron in a hydrogen atom?
| 1. | \(h\) | 2. | \(\dfrac{h}{2}\) |
| 3. | \(\dfrac{h}{2 \pi}\) | 4. | \(\dfrac{h}{\lambda}\) |
Subtopic: Bohr's Model of Atom |
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The velocity of an electron in the seventh orbit of a hydrogen-like atom is \(3.6\times 10^6\) m/s. The velocity of the electron in the \(3^{\text{rd}}\) orbit is:
1. \( 4.2 \times 10^6 ~\text{m/s} \)
2. \( 8.4 \times 10^6 ~\text{m/s} \)
3. \( 2.1 \times 10^6~\text{m/s} \)
4. \( 3.6 \times 10^6 ~\text{m/s} \)
1. \( 4.2 \times 10^6 ~\text{m/s} \)
2. \( 8.4 \times 10^6 ~\text{m/s} \)
3. \( 2.1 \times 10^6~\text{m/s} \)
4. \( 3.6 \times 10^6 ~\text{m/s} \)
Subtopic: Bohr's Model of Atom |
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Which of the following statements correctly describes Bohr's model of the atom?
| 1. | It incorporates Einstein’s photoelectric equation. |
| 2. | It predicts a continuous emission spectrum for atoms. |
| 3. | The quantization of angular momentum is a key postulate of Bohr's model. |
| 4. | It predicts identical emission spectra for all types of atoms. |
Subtopic: Bohr's Model of Atom |
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The radius of the innermost electron orbit in a hydrogen atom is \(5.3\times 10^{-11}~\text{m}.\) What is the radius of the third orbit?
| 1. | \(11.3\times 10^{-11}\) m | 2. | \(12.9\times 10^{-11}\) m |
| 3. | \(15.9\times 10^{-11}\) m | 4. | \(47.7\times 10^{-11}\) m |
Subtopic: Bohr's Model of Atom |
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The total energy of an electron in the \(n^{th}\) stationary orbit of the hydrogen atom can be obtained by:
1. \(E_n = \frac{13.6}{n^2}~\text{eV}\)
2. \(E_n = -\frac{13.6}{n^2}~\text{eV}\)
3. \(E_n = \frac{1.36}{n^2}~\text{eV}\)
4. \(E_n = -{13.6}\times{n^2}~\text{eV}\)
Subtopic: Bohr's Model of Atom |
86%
Level 1: 80%+
NEET - 2020
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