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 |
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. \(\frac{1}{47}\)
1. \(2000~\mathring{A}\)
2. \(4000~\mathring{A}\)
3. \(4500~\mathring{A}\)
4. \(9000~\mathring{A}\)
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. |