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 |
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 |
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 |
1. | \(145\) | 2. | \(160\) |
3. | \(172\) | 4. | \(157\) |
1. | \(\frac{1}{Ze} \) | 2. | \(v^2 \) |
3. | \(\frac{1}{m} \) | 4. | \(\frac{1}{v^4}\) |
1. | \(\dfrac{k e^{2}}{r^{2}}\) | 2. | \(\dfrac{k e^{2}}{2 r}\) |
3. | \(\dfrac{k e^{2}}{r}\) | 4. | \(\dfrac{k e^{2}}{2 r^{2}}\) |
In a Rutherford scattering experiment when a projectile of charge and mass approaches a target nucleus of charge and mass the distance of closest approach is . 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 \(M_1\) |
1. | its potential energy increases and kinetic energy decreases. |
2. | its potential energy decreases and kinetic energy increases. |
3. | both kinetic energy and potential energy increase. |
4. | both kinetic energy and potential energy decrease. |
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. | \(\dfrac{1}{47}\) |