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The Rutherford $\mathrm{\alpha}$-particle experiment shows that most of the $\mathrm{\alpha}$-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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If an alpha nucleus of energy $\frac{1}{2}m{v}^{2}$ bombards a heavy nuclear target of charge Ze, then the distance of closest approach for the alpha nucleus will be proportional to:

1. | \(\frac{1}{Ze} \) | 2. | \(v^2 \) |

3. | \(\frac{1}{m} \) | 4. | \(\frac{1}{v^4}\) |

Subtopic: Various Atomic Models |

84%

From NCERT

AIPMT - 2010

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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 closest approach is ${r}_{0}$. What is the energy of the projectile?

1. | Directly proportional to \(M_1 \times M_2\) |

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%

From NCERT

NEET - 2009

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When an α– particle of mass m moving with velocity v bombards a heavy nucleus of charge Ze, its distance of closest approach from the nucleus depends on m as:

1. $\frac{1}{\sqrt{\mathrm{m}}}$

2. $\frac{1}{{\mathrm{m}}^{2}}$

3. m

4. $\frac{1}{\mathrm{m}}$

Subtopic: Various Atomic Models |

80%

From NCERT

NEET - 2016

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In an $\alpha $-particle scattering experiment, the number of particles scattered per minute in a direction perpendicular to the direction of incident particles is 40. What will be the number of particles scattered at an angle of 60° per minute?

1. | 145 | 2. | 160 |

3. | 172 | 4. | 157 |

Subtopic: Various Atomic Models |

71%

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A beam of fast-moving alpha particles were directed towards a thin film of gold. The parts A', B', and C' of the transmitted and reflected beams corresponding to the incident parts A, B and C of the beam, are shown in the adjoining diagram. The number of alpha particles in:

1. | B' will be minimum and in C' maximum |

2. | A' will be maximum and in B' minimum |

3. | A' will be minimum and in B' maximum |

4. | C' will be minimum and in B' maximum |

Subtopic: Various Atomic Models |

67%

From NCERT

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What was Rutherford's atom according to classical theory?

1. | electrostatically stable. |

2. | electrodynamically unstable. |

3. | semi-stable. |

4. | stable. |

Subtopic: Various Atomic Models |

62%

From NCERT

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An electron is moving around the nucleus of a hydrogen atom in a circular orbit of radius r. What is the coulomb force $\overrightarrow{\mathrm{F}}$ between the two? \(\left ( \text{where},K=\frac{1}{4\pi \epsilon _{0}} \right )\)

1. $\mathrm{K}\frac{{\mathrm{e}}^{2}}{{\mathrm{r}}^{2}}\hat{\mathrm{r}}$

2. $-\mathrm{K}\frac{{\mathrm{e}}^{2}}{{\mathrm{r}}^{3}}\hat{\mathrm{r}}$

3. $\mathrm{K}\frac{{\mathrm{e}}^{2}}{{\mathrm{r}}^{3}}\overrightarrow{\mathrm{r}}$

4. $-\mathrm{K}\frac{{\mathrm{e}}^{2}}{{\mathrm{r}}^{3}}\overrightarrow{\mathrm{r}}$

Subtopic: Various Atomic Models |

53%

From NCERT

AIPMT - 2003

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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 |

59%

From NCERT

NEET - 2016

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In Bohr's model if the atomic radius of the first orbit is r_{0}, then what will be the radius of the third orbit?

1. $\frac{{\mathrm{r}}_{0}}{9}$

2. ${\mathrm{r}}_{0}$

3. $9{\mathrm{r}}_{0}$

4. $3{\mathrm{r}}_{0}$

Subtopic: Bohr's Model of Atom |

87%

From NCERT

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